Acer LCD monitor says no signal

January 17, 2011 at 08:59:37
Specs: Windows XP
The monitor I have is an Acer 17" V173 LCD monitor. It will say no signal and other times says input not supported. But when it ways no signal, my pc is still on , but the monitor is black.

See More: Acer LCD monitor says no signal

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#1
January 17, 2011 at 09:01:07
compatibly issue I think with your graphics it might not support the resolution

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#2
January 17, 2011 at 09:04:40
The monitor was acting fine for the past 3 yrs. that I have had it. Is there a way to check or fix this issue?

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#3
January 17, 2011 at 09:10:51
have you tried it on a different pc or laptop.

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Related Solutions

#4
January 17, 2011 at 10:25:48
"It will say no signal and other times says input not supported."

Both those messages are generated by the monitor itself, not your operating system. You probably will get the first message when the video cable is not connected at all and you then power on the monitor, after a few seconds. The second message indicates the settings used for the monitor in the operating system are not supported by the monitor.
.......

If the monitor works fine with another computer, and if your video is fine while booting BEFORE Windows is supposed to load, you probably need to re-set the Monitor type.

For 2000 or XP...
See response #9 here:
http://www.computing.net/answers/ha...

starting at....
Boot into Enable VGA mode.

Note - that's missing this -

Remove any bootable CDs or DVDs you have in drives.
Press F8 repeatedly while booting, don't hold down the key, starting very early in the boot.
When the Windows boot choices menu appears, choose Enable VGA mode.
........

If the monitor works fine with another computer, and if you have NO video at all while booting, something else is wrong.

Some computers have both onboard video - a video adapter built into the mboard - and video from a card installed in a mboard slot.

In most cases, installing a PCI-E X16 or an AGP card in a mboard slot automatically disables the onboard video. If you have the monitor plugged into a video port for the onboard video when the card is plugged in, there is no video at all from the onboard video port.

In the case of a mboard that has onboard video and also has Hybrid CrossfireX support (AMD main chipsets) , or Hybrid SLI support (NVidia main chipsets), or Hybrid Multimonitor support (Intel main chipsets), if you are using a video card in a PCI-E X16 slot, if the video chipset on the card in the slot is NOT one of the ones compatible with the Hybrid video feature, by default you will NOT get any video from the card in the PCI_E X16 slot, and the onboard video is still enabled. You must change at least one if not two settings in the bios Setup in order to get video from the card in the slot and disable the onboard video.

Other causes...........

- for any system -

- you're experiencing ram error problems, which are almost always caused by the ram having a poor connection in it's slot(s), or by the bios settings for the ram being incorrect, or by you using ram modules that are not 100% compatible with using them in the mboard or not compatible with being used along with other ram modules if you have more than one module and more than one part number of them.
While booting you may hear the normal one mboard beep, or no beeps, or a pattern of beeps that indicate a memory problem or no ram detected. .

- rarely
- the mboard has developed failing electrolytic capacitors
- the mboard is otherwise defective or damaged.


-- for a desktop system

- you're having power supply problems - the mboard is not booting all the way because of that - in that case you do not hear the normal one mboard beep while booting.


- for a laptop, if the laptop has been used a lot

- your AC adapter, main battery, or the jack on the laptop the AC adapter plugs into, or a small power related board inside the laptop, has a problem.

- the built in display's backlight (CCFL) or the voltage inverter that supplies it with high voltage is in the process of failing or is dead, or there is at least one broken wire between the video adapter and the display, usually right where the wiring passes through the hinge area. Usually an external monitor will work fine in that case - there's nothing wrong with the video adapter.


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#5
January 17, 2011 at 10:49:19
Make sure the the VGA cable is properly connected to the video card.

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#6
August 17, 2011 at 20:32:47
hi,

i had buyed a new acer lcd monitor of 15.6 inches. after starting my computer when am trying to get bios by pressing del my lcd monitor is not displaying bios and boot up menu.
when i try this in crt it worked fine.

Any help will be appriciated

Thanks


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#7
August 17, 2011 at 21:52:27
venkakrishna8

Tell us the make and model of your brand name computer, or if you have a desktop computer, the make and model , or at least the model, of your motherboard.

If your problem is the only video you are getting is an error message like in the first post in this Topic, you computer may not be working properly. See response 4.

If your problem is you get no display on the monitor at all.....

- is this a desktop computer ?
If yes, does it have both onboard graphics - a video adapter built into the mboard - and a graphics card in a mboard slot ?
If yes, you may have it plugged into the video port for the onboard graphics - the onboard video is disabled automatically when you plug the graphics card into a PCI-E X16 or AGP slot on the mboard.

- if you are using a DVI to VGA adapter in a DVI video port for onboard video, some newer main chipset's onboard video does NOT work with those adapters because the DVI output is digital only, not DVD-I which support both DVI and VGA monitors.

- there is no such thing as a VGA to DVI adapter that will work with a VGA video port to produce DVI video on the monitor - there are not enough connections in the 15 pin port for the DVI video to work. .

If you DO have video on the monitor but you can't get into the bios.....

- if you are using a USB keyboard, you can't get into the bios by pressing a key on the USB keyboard unless the Legacy USB or a similar setting is enabled in the bios.
Older bioses often have that setting disabled by default; newer bioses usually have that setting enabled by default.

A PS/2 keyboard always works to get into the bios. .

-if you are using an adapter on the end of the keyboard's cord to adapt it to another type of port, the adapter won't make the keyboard work unless
- the keyboard is a "combo" keyboard that was designed and wired up to be used with both types of ports
- an adapter that works with a "combo" mouse, often green, will often not work with a "combo" keyboard, and an adapter that works with a "combo" keyboard, often purple, will often not work with a "combo" mouse, because the necessary connections are not there within the adapter.


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#8
August 18, 2011 at 09:44:19
venkatkrishna8 you should have started your own post to do with your own issue. This post is to resolve CrimsonTides problem.

Please let us know if our advice was able to help you.


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#9
August 18, 2011 at 10:24:40
hi,

Thanks for reply.
sorry i dnt knw wat does this dvd-i port or vga.


Computer is desktop computer. i have tested with a crt monitor and my acer lcd monitor. so. wat i done is. i started my pc and keep on pressing del then my acer lcd monitor showing input not supported floating box but not showing bios. i removed the plug of lcd monitor and kept crt plug to pc then it showing bios. by my experiment i got that my system is opening bios on pressing del but not showing in acer lcd monitor.

mother board :mercury p1865d7
keybopard- ps/2
i even called to acer customer service. the reply i got is.
this acer lcd monitor will run for higher resolution of mother board so they told to upgrade my motherboard resolution.

i asked them is it the screen resolution?. they said its not the screen resolution its mother board resolution.

should i need to change my mother board or graphic card or any video card.

i knw nothing abt this hadware equipments.

Any help please.


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#10
August 18, 2011 at 20:34:30
venkakrishna8

Tell us the model of your LCD monitor.
If that's not obvious on the front of it, that's usually on the back of it on a label.

"mother board :mercury p1865d7"

You made a typo.
It's supposed to be an i or I (capital letter i), not a 1 (one) , after p or P.

Mercury PI865D7 motherboard (home support page)
http://www.mercury-pc.com/product-d...

Your mboard has onboard video - a video adapter built into the mboard.

I looked at it's manual - it has a VGA port for that onboard video

Are you plugging BOTH of the monitors into that VGA port, one at a time ?

Do both monitors have this connector on the end of their cords......

Picture of a male VGA connector like on a VGA monitor's cord
http://d3f0jbia68uwkd.cloudfront.ne...
..........

All modern mboards, mboard bioses, video adapters, and operating systems such as Windows support basic VGA video without needing any software for the monitor or the video adapter on the hard drive. You can have that video even if you have no hard drive.

The LCD monitor should ALWAYS have video while booting the computer BEFORE Windows starts to load. There may be settings in Windows that are not correct for the LCD monitor, but it should always have video before Windows loads.

If you're plugging the LCD monitor into the SAME VGA port the CRT monitor works with, if you never see anything on the screen except that error message, the LCD monitor probably does not work with ANY computer !
Try it with another computer.
.......

If you have a video card plugged into the AGP slot on the mboard, that's a different situation.
In that case, you have a VGA port for the onboard video, - the one that is built into the mboard that's up higher on the back of the computer case - AND a video port on the video card, which is lower down on the back of the computer case, which may be VGA or DVD-I .

(The AGP slot is the one of the four yellow slots in the front of this picture of the mboard that is closest to the center of the mboard:
http://www.mercury-pc.com/product-d...
The other three there are PCI slots. )

If you are plugging each monitor into two SEPARATE video ports, the VGA port for the onboard video does NOT produce video when the AGP video card is installed in the AGP slot - it's automatically disabled when the AGP card is installed !
If you have the LCD monitor plugged into the VGA port for the onboard video - the one that is built into the mboard that's up higher on the back of the computer case - you can't get video on the LCD monitor !
......

If you have a PCI video card installed in a mboard slot, installing that PCI card DOES NOT automatically disable the onboard video. However, when you have two monitors plugged in, one into the onboard video, the other into the PCI video card, often only ONE of the two monitors will display video BEFORE Windows loads, AND Windows enables only ONE display by default.
RIGHT click on a blank part of your main desktop screen, select Properties, then Settings.
Hold your cursor over the two display icons, one at a time - one will say "Not Active". RIGHT click on that one and enable it !
Then you will then have video on both monitors in Windows ( if the resolution setting for the LCD monitor is compatible with it - see below).
.......

The mboard manual shows that the bios has USB Keyboard, and USB Mouse, Enabled by default.

Your mboard does use the Del key to get into the bios, but you must press Del while booting the computer early in the boot sequence before the operating system loads in order to get into it.
......

Picture of a DVI port (DVI-I)
http://vocaro.com/trevor/blog/wp-co...

Pictures of the different DVI ports:
http://www.erenumerique.fr/images/3...

Most on computer mboards, and most if not all on video cards you plug into a mboard slot, are DVI-I dual link
Some on newer mboards are DVI-D dual link

Picture of a male DVI connector like on a DVI monitor's cord
http://www.computertroublesolver.co...

Picture of a DVI to VGA adapter
http://www.kenable.co.uk/images/dvi...

That's for adapting a monitor with a VGA connector on it's cable so that it will work with a DVI-I port.
They do not work with DVI-D video ports.
.............

"this acer lcd monitor will run for higher resolution of mother board so they told to upgrade my motherboard resolution.

i asked them is it the screen resolution?. they said its not the screen resolution its mother board resolution"

You're not getting it.

The resolution setting is in the operating system.
E.g. in XP
RIGHT click on a blank part of your main desktop screen, select Properties, then Settings.
The resolution setting is shown there.
It's the width of the display (in pixels) x the height (in pixels).
e.g. 640x480, 1024x768, 1280x960

The LCD monitor does not need that resolution setting to be compatible while booting BEFORE Windows loads !
If it's NOT compatible AFTER Windows loads, then you will get an error message on the LCD monitor screen.

The mboard does not need that resolution setting to be compatible BEFORE Windows loads !
......

The LCD monitor DOES need that resolution setting to be compatible AFTER Windows loads.

The later CRT monitors are capable of higher resolution settings than the earlier LCD monitors can use. If an earlier LCD monitor is connected to the same video port that worked with a later CRT monitor, you MAY get NO display in Windows from the LCD monitor AFTER Windows loads. That can be easily fixed.

All LCD displays (monitors or built in) have a "native" or "optimal" resolution setting that they look the best set to.

When you provide your LCD monitor model, we can tell you what that is for your monitor



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#11
August 19, 2011 at 08:56:35
hi,

Thanks for replying.

wat a good post it was. thanks .

And coming to the problem. : Lcd Monitor : Acer P166HQL.

Mother board : its i not 1. sorry.

i didnt kept both lcd and crt at a time. first i started with lcd and after pressing del i didnt get bios so i removed vga cable of lcd from pc and kept crt vga cable. then it showned bios. it means bios is opening but not showing in lcd.

and finally i have registered a complaint with acer. one of the technician had came and he checked the monitor and said this is not supporting for your cpu.

and happiest news is he is going to replace my lcd with new one in a week.

Thanks for your reply.

And your are awesome.


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#12
August 19, 2011 at 11:11:39
venkakrishna8

"Acer P166HQL"

Acer P166HQL (home support page)
http://support.acer.com/us/en/produ...


User Guides
User Manual
- that shows that it's "native" or "optimal" resolution is
1680x1050
at a 60Hz vertical refresh rate.
........

You have NOT said
- if you are getting ONLY an error message on the LCD monitor, at ALL times
- or - if you are getting ONLY an error message on the LCD monitor ONLY after Windows is supposed to load - the video is fine while booting the computer BEFORE Windows is supposed to load.

- whether there is more than one video port on the back of the case
- if there is more than one, whether you were plugging the two monitors, one at a time, into different video ports.
.....

"and finally i have registered a complaint with acer. one of the technician had came and he checked the monitor and said this is not supporting for your cpu. "

The term CPU is frequently mis-used. Your computer case and the hardware components inside of it IS NOT the CPU. The CPU is the processor (microprocessor) integrated chip that's installed in a socket on the mboard.

It's got nothing to do with your CPU being incompatible with the monitor. He found that the monitor is defective.

"and happiest news is he is going to replace my lcd with new one in a week."

That's good.

Follow the instructions in the User Manual to install it's drivers properly in Windows.
.....

If you're using the onboard video adapter, you may NOT be able to select the 1680x1050 "native" or "optimal" resolution.
If so, try choosing a resolution that has the same ratio of width to height when you divide the first number by the second one - 1.6 (to 1) Your display aspect ratio is 16:10 - 16 units wide per 10 units high.
And - turn on Clear Type
Turn on Clear Type in Windows XP or Vista or Windows 7- makes type / fonts on LCD screens look clearer.
http://www.microsoft.com/typography...


If you can't select a resolution with the same ratio of width to height, or if you can but the display doesn't look very good, you will need to buy a video card, preferably an AGP video card, that has a new enough (when it was first released) video chipset to support the
1680x1050 resolution that the LCD monitor looks best when set to.


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#13
August 19, 2011 at 20:18:44
Hi,

Monitor works fine after loading windows. untill that it doesnt show anything except "Input not supported" . that means the screens which appear before windows load are not showned by monitor. if i Plug in crt its works fine . it shows all the screens before windows loads.

So the functionality is working fine. but the lcd monitor is unable to show bootup or Bios sreens.

and when i tested this monitor with another system the same result after pressing "del" -- "Input not suppoted appeared first but after 2 seconds it showned bios.

even though it showned my question is why the screen showing input not suppoted for first time.

and another is why bios is not showing for my system. after getting input not supported.


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#14
August 19, 2011 at 21:07:12
venkakrishna8

Why ?

The short answer - Your LCD monitor is defective !

It's possible for the video adapter to be damaged such that it is NOT working fine while booting, but it works fine after Windows loads after the specfic drivers for the video adapter have been loaded in Windows, but when the CRT monitor works fine all the time plugged into the same video port, your LCD monitor is defective !
You should NEVER get that message while booting "Input not supported", except for very briefly when there's no video (blackness) on the screen in any case, then it goes away, BEFORE Windows starts to load, if the video adapter is working fine !

I have noticed that with a friend's Acer LCD monitor, it also displays "Input not supported" or similar, but ONLY very briefly when there's no video (blackness) on the screen in any case, then it goes away.
Cheaper monitors such as Acer models sometimes do that, but better quality LCD and CRT monitors wait a longer time when there is no video before they display a similar message.
....

"What we have here......... is a failure to communicate ! "
(A line from Cool Hand Luke, the movie.)

"Monitor works fine after loading windows. untill that it doesnt show anything except "Input not supported" ..... " "if i Plug in crt its works fine . it shows all the screens before windows loads."

If you had told us that in your first post, and if you had also said you plugged both monitors into the SAME video port, one at a time, I could have told your your LCD monitor is defective in my first response post to you (response 7) !


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#15
August 19, 2011 at 23:07:36
sorry for that.


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#16
August 19, 2011 at 23:25:21
venkakrishna8

It's not just you - it's a very frequent problem we have with a lot of people who start Topics.

Apparently Mercury is a major brand in India. Are you in India ?

I'm in western Canada - Alberta.


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#17
August 20, 2011 at 03:02:44
yes iam from india

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#18
September 10, 2011 at 01:51:37
hey my desktop pc was working fine for about 3 years.Once i had kept my pc ON for downloading purpose for entire night but in morning i saw that my pc was switched OFF due to power failure in the knight.I am having UPS but that also went OFF after the power failure in some time.I checked my monitor by connecting it with my laptop and it is working fine.Also have checked all the cables and replaced my old RAM with new one but the problem of no signal on monitor is still their. after starting the pc the cpu works fine and doesn't give any beep sound but monitor goes into sleep mode.plzzzzzzzzzz help me.

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#19
September 10, 2011 at 07:21:56
DEEPRAJ KANUKAR

Power failure events can damage the computer's power supply or the mboard or anything connected to the mboard even when you are using a UPS or a device that protects against power spikes and surges. Lightning strikes in your area or to the AC power grid in your area can cause damage despite you having the computer protected by those things even if the AC power to the computer is switched off when the computer is still plugged in (very high voltage spikes can jump across switches that are off).
People often DO NOT have everything that connects to the computer that plugs into AC power directly or indirectly via a AC to DC adapter AND the cable that connects the computer to the internet (if you're using a wired network adapter to connect to a device that connects to the internet) protected against damage cauised by power spikes and surges. UPSs usually DO NOT have enough AC plug-ins to protect everything that connects to the computer.

People often try changing which ram they have installed in the mboard when their computer will not boot normally, but in most cases there's absolutely nothing wrong with it. If the ram you installed to replace it is not 100% compatible with being installed in your mboard, that alone can cause no boot and no mboard beeps.
You are usually better off having the original ram installed to avoid that possibility.

It is easy to test for whether damaged or incompatible ram has caused your mboard to fail to boot, or it's caused by another problem.

Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.

The monitor DOES NOT go into sleep mode on it's own, and the operating system NEVER starts up in sleep mode. You should get video while booting the computer BEFORE the operating system loads in any case, even when the hard drive is disconnected. .
Your problem is that for whatever reason the computer is producing no video output.

The term CPU is frequently mis-used.
The computer case that has most of your computer's hardware components inside of it IS NOT A CPU !

What is a CPU?
http://wiki.answers.com/Q/What_is_a...

Central processing unit
http://en.wikipedia.org/wiki/Centra...

If this is a desktop computer, if you are fortunate, the power supply may be the only thing that has been damaged by the power failure event..

Failing (or in your case, damaged) power supplies are common and can cause your symptoms.
Check your PS.
They often partially work, fans and hard drives may spin, leds may come on, yet you may get no video and the mboard will not boot all the way.
See response 4 in this:
http://www.computing.net/hardware/w...

If it is failing, you can usually replace it with any decent standard sized standard ATX PS with the same capacity or greater.

Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.

Don't buy an el-cheapo PS.
See response 3 in this:
http://www.computing.net/answers/ha...

I no longer recommend Cooler Master, AOpen, or Sparkle power supplies.


If you can, try temporarily connecting a used power supply from a working system to your computer to see if the computer will then work normally, BEFORE you buy a power supply.

If that doesn't help, your mboard has probably been damaged, and your cpu(processor), ram, and your drives are probably okay.
........

Sometimes power failure events cause poor connections inside your case somewhere.

Unplug the case/power supply.
Power off your monitor.
Open up the case by removing the left panel as seen when you're looking at the front of the case.
Check all the connections of the wiring to make sure they are all the way onto their pins and into their sockets, especially the main connector from the power supply. The wires close to the mboard going into the main power connector/socket should be more or less perpendicular to the mboard surface rather than at an angle. Make sure the ram modules and all cards in slots are all the way down in their slots.


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