computer screen turns on and off at start up

November 3, 2011 at 11:13:59
Specs: Windows 7
computer monitor flashes on and off - my computer monitor turns on and off really quickly at the start up of my tower, i find if i leave it for a bit it will turn on but has gone past this point now.. i then plugged my brothers monitor in to my pc to see if that would work as there is now a problem with my pc as it there is no output from my mouse and that won't work now.

any info would be great cheers!


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#1
November 3, 2011 at 12:05:57
Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard.

The specific model of a brand name system is often shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site and loading a program they have available, if Windows is still working, on the subject computer.

If it's a Dell computer...
Go here for how to find the Service tag "number":
http://support.dell.com/support/top...

Tell us what it is.

If it's a HP or Compaq computer.....
Go here:
http://partsurfer.hp.com/search.aspx
Scroll down a bit.
Look for the similar label on the outside of your computer.
Quote the specific model number - that's at the end of the first line.
Quote the Product number - that's on the third line.

If it's a Lenovo computer

Find your specific Product number and tell us what it is:

Finding my product number
http://support.lenovo.com/en_IN/Fin...

The model, sometimes the make, of a mboard in a generic desktop system is usually printed on the mboard's surface in obvious larger characters, often between the slots.
.....

You could try your monitor with your brother's computer, but there's probably nothing wrong with it.

Sometimes video drivers you have loaded in Windows can cause the display to briefly disappear while loading Windows, but it comes back right away and that shouldn't happen after that, and the same thing would have been happening from when you first installed those drivers.

Describe your symptoms. The more details you supply, the better.

e.g.

Is the mboard booting fine, you have video before Windows is supposed to load ?

If yes, do you have video in Windows ?

Are the power led and hard drive activity led lighting up ?

Does the hard drive activity led blink like it normally does while booting ?

Does the mboard beep once or twice like it normally does while booting ?

Do you hear the CPU fan and hard drive spinning ?

Is the power supply fan spinning and blowing air out of the back of the case ?

.....

Have you moved the tower case from one place to another since the computer last worked properly ?
(It doesn't necessarily have to have been recently.)


Have you been fiiddling with wiring connections or cards or ram modules inside the case since your computer last worked properly ?
(It doesn't necessarily have to have been recently.)


Have you installed a video card in a mboard slot that the computer did not originally come with ?
(It doesn't necessarily have to have been recently.)

Has there been a power failure event at where the computer is, or lightning strikes in your area, since the computer last worked properly ?
(It doesn't necessarily have to have been recently.)


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#2
November 3, 2011 at 12:34:49
It's an advent computer, and I'm not too sure what you mean with all this jargon, ha!

"You could try your monitor with your brother's computer, but there's probably nothing wrong with it.

Sometimes video drivers you have loaded in Windows can cause the display to briefly disappear while loading Windows, but it comes back right away and that shouldn't happen after that, and the same thing would have been happening from when you first installed those drivers.

Describe your symptoms. The more details you supply, the better.

e.g.

Is the mboard booting fine, you have video before Windows is supposed to load ?
My computer loads up fine (or did un til a couple of hours ago) just the monitor doesn't have the chance to turn on... the light literally flickers on and off.

If yes, do you have video in Windows ?

Are the power led and hard drive activity led lighting up ?
Yep.

Does the hard drive activity led blink like it normally does while booting ?

Does the mboard beep once or twice like it normally does while booting ?
Not sure if it even does that..

Do you hear the CPU fan and hard drive spinning ?
Yeah.

Is the power supply fan spinning and blowing air out of the back of the case ?
Yeah.
.....

Have you been fiiddling with wiring connections or cards or ram modules inside the case since your computer last worked properly ?
No.

Have you installed a video card in a mboard slot that the computer did not originally come with ?
(It doesn't necessarily have to have been recently.)
No.
Has there been a power failure event or lightning strikes in your area since the computer last worked properly ? I think there has yeah, but it was a while back.
(It doesn't necessarily have to have been recently.)"

I think the problem is with my monitor not the tower, as if I leave the monitor for a while it will turn on and then go into standby, but now after switching my tower off at the on button a few times its gone weird (turning off straight away when i press the power button instead of loading and then shutting down, and my mouse and keyboard seem to be unresponsive (no led light on my mouse)).



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#3
November 3, 2011 at 13:53:22
Thank you for supplying a reasonable amount of answers and more details. Our biggest problem on this web site is the person who started the topic doesn't supply enough info, even after we ask questions or ask for further details. It doesn't dawn on most of them that they can simply copy our questions, paste them in their post, then supply answers, to avoid a lot of typing.
......

"It's an advent computer, and I'm not too sure what you mean with all this jargon, ha!"

Going by past experience, there is no Advent web site anymore.

The only thing you can do is to tell us everything that's on the label - we may or may not be able to find info about your computer.

""The specific model of a brand name system is often shown on a label on the outside of the case somewhere....""

Us knowing where to find the details about your system, if available, often reduces the amount of guesswork we would otherwise have to do to help you figure out your problem.
....

""Is the mboard booting fine, you have video before Windows is supposed to load ? ""

"My computer loads up fine (or did un til a couple of hours ago) just the monitor doesn't have the chance to turn on... the light literally flickers on and off."

Whether your computer worked fine before is a lot less important than what it is doing now.
When you have video symptoms there's usually nothing wrong with your monitor - something else is wrong.
...

""If yes, do you have video in Windows ?""

Going by what you've said, that's no and no, at least not normal video.
...

""You could try your monitor with your brother's computer, but there's probably nothing wrong with it ""

Did you try that ?
....

""Are the power led and hard drive activity led lighting up ?""

"Yep."

Good.
...

""Does the hard drive activity led blink like it normally does while booting ?""

What's your answer to that ?
...

""Does the mboard beep once or twice like it normally does while booting ?""

"Not sure if it even does that.."

You normally hear one or two beeps from the mboard while booting when the bios's POST (Power On Self Test) completes successfully.
You're not hearing that ?
....

""Do you hear the CPU fan and hard drive spinning ?""

"Yeah."

Good.
...

""Is the power supply fan spinning and blowing air out of the back of the case ?""

"Yeah."

Good. Some power supplys have cheap sleeve bearing fans that tend to stop spinning after a year or two. When the fan is not spinning, the power supply is damaged eventually from the components inside of it overheating.
...

""Has there been a power failure event or lightning strikes in your area since the computer last worked properly ?
(It doesn't necessarily have to have been recently.)""

" I think there has yeah, but it was a while back."

AHA !
Power failure events can cause power surges and / or voltage spikes that can damage anything on your computer or anything connected to it at the time.

Also, they can cause causes wiring connections or components inside the case to develop a poor connection.

The symptoms of that don't necessarily show up right away.

If you connect another power supply you may find your computer then works fine.

For more info, see response 1 here:
http://www.computing.net/answers/ha...

(Close the window for that to come back to this Topic.)
...

"I think the problem is with my monitor not the tower, as if I leave the monitor for a while it will turn on and then go into standby, but now after switching my tower off at the on button a few times its gone weird (turning off straight away when i press the power button instead of loading and then shutting down, and my mouse and keyboard seem to be unresponsive (no led light on my mouse))."

When you have video symptoms there's usually nothing wrong with your monitor - something else is wrong.

All of those symptoms can be caused by a power supply that is failing or defective, or less likely a damaged mboard.

Try connecting a power supply from another working computer to your mboard, if you can, as described at the link above, or try your power supply with another working computer, if you can.
The former may allow your system to work fine if there's nothing else wrong with your computer.
The latter will show you right away whether your power supply is damaged or defective if that other system does not work fine.

E.g.
If the power supply is NOT producing what is supposed to be an accurate +5.0v within 10% anymore
- devices that require +5v will probably not work properly or not work at all - e.g. all mice and keyboards, all USB devices, floppy drives, optical drives. Hard drives need +5v too but they also need +12.0v - so do desktop optical drives - but will still work if the 5v is out of whack - optical drives probably will not.
- if what was supposed to be an accurate +5.0v is zero, none of those devices (except hard drives) will work properly at all
- if what was supposed to be an accurate +5.0v is more than 10% below 5.0, but above zero, those devices probably won't work properly
- if what was supposed to be an accurate +5.0v is more than 10% too high, all devices that use +5v will be damaged, sooner or later.. The first to fry is often the floppy drive's board.

If you can still get into the bios with the present power supply connected, find the voltage readings in the bios . the +3.3v, +5.0v, and +12.0 v readings must be within 10% of the nominal value. Even if they are, there can be other things wrong with the power supply.
...........

If it is failing, you can usually replace it with any decent quality 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 (in quality) PS.
See response 3 in this:
http://www.computing.net/answers/ha...

Note - I may have mentioned Cooler Master in that - I have recently found some models have only a 1 year warranty, some are known to have premature fan failures, some are known to develop failing electrolytic capacitors.
I also no longer recommend AOpen or Sparkle PSs. Since i made that post, both of those brands have developed failing electrolytic capacitors on my own computers or on the computers of otherb people I know.

Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.

If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should have.


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