No Signal

Hewlett-packard / Dc57000 micro tower
January 26, 2010 at 11:38:13
Specs: Windows XP
Please help me. Every time I turn on my PC, a red light flashes on the tower and it keeps beeping. The screen and the keyboard don't come on but I I turn on the screen manually it just says No Signal Detected and goes off again.

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January 26, 2010 at 11:52:57
The message is probably being generated on the monitor itself. It may do the same when the monitor is unplugged from the video port, when you switch off the monitor then switch it on.

You are probably getting the message because you are getting no video from the computer.

I'm assuming the video cable is connected from the monitor to the computer, and that it's plugged into the right video port on the computer if you have more than one.

Usually when you get no video, there's nothing actually wrong with your video adapter or your monitor - something else is wrong. You could try connecting the monitor to a different computer, but it sounds like there's nothing wrong with it.

Was anyone fiddling around inside the computer case with connections, or components - e.g. plugging in or unplugging ram or a card in a slot - since the last time the computer worked properly?

Has the computer been moved physically from one place to another since the last time the computer worked properly, such as to a different room or abode?

Has the computer been subjected to any physical jolt since the last time the computer worked properly, such as it was bumped or dropped?

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January 26, 2010 at 12:00:20
It hasn't been moved at all apart from me just pulling it out to disconnect and reconnect all the cables. It was fine the last time I used it though

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January 26, 2010 at 13:01:41
According to HP's web support on a dc5000, the flashing red light on the front of your PC gives the meaning of the error.
Number of 1-second red LED blinks followed by 2 second pause, then repeats:
2 blinks- processor thermal protection activated
3 blinks- processor not installed
4 blinks- power supply failure
5 blinks- memory error
6 blinks- video error
7 - PCA Failure (ROM detected failure prior to video)
8 - invalid ROM, bootblock recover mode

So, how many flashes separated by 1 second intervals does your PC have? This will then indicate what hardware problem you have.

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Related Solutions

January 26, 2010 at 14:41:49
There are 5 blinks, memory error? Can I fix this?

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January 26, 2010 at 15:26:18
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.

A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
This usually happens a long time after the ram was installed, but it can happen with new ram, or after moving the computer case from one place to another, and I've had even new modules that needed to have their contacts cleaned.

See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:

Restore power.
Try booting.

If doing just that doesn't help...

It's extremely rare for ram that worked fine previously to spontaneosuly go "bad", and even more unlikely for more than one module to go "bad" at the same time, but if ram that is incompatible with the mboard chipset or the cpu has been installed, memory errors will likely occur, and in the worst cases the computer will not boot, and the mboard may not beep at all.
Did anyone change which ram is installed since the last time the computer worked properly?

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 all cards in slots are all the way down in their slots.

While you're in there, if the cpu fan/heatsink has mung (dust, lint, etc.) on it, clean it off, but DO NOT use a vaccuum cleaner to do that (they produce a tremendous amount of static electricity when running, and anything connected to them can discharge that to your components) - use canned air, or an air nozzle if you have access to an air compressor, or an artist's brush that can be used in small spaces, etc. It may be difficult to clean the top of the heatsink under the cpu fan - the most likely place to have mung on it - and the bottom side of the cpu fan blades unless you remove the fan. If you have a case fan, clean that too if it needs it.

If you have a video card installed in a mboard slot, if that has a fan and heat sink on it, check that for mung too.

Check the power supply openings for mung too.

With the cover still off, restore the AC power, start the computer and make sure the cpu fan spins - if it doesn't spin, if you're sure the power supply is working okay, don't use the computer until you have replaced it.
If it spins too slowly, and/or if it makes rattling or screeching noises, most likely to be noticed when the computer has cooled to room temp, has not been used for a while, and then is started up, the cpu fan's bearings are failing - replace it as soon as you can.

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January 26, 2010 at 20:37:13
Yes you can fix this. first you need to reseat your ram. when ram heats and cools it can become unseated and not get a good connection. By reseating it taking it out of the slot and putting it back in then you may get your pc to work. If that doesn't work then you may need to replace the ram

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January 27, 2010 at 13:24:24
I'm totally lost now, I don't even know what a RAM is lol. I better just bring it to one of those computer doctors guys, (hope it doesn't cost too much, this PC means a lot to me), but thank you very much for trying to help me, I really appreciate it :-)

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January 27, 2010 at 23:27:09
See Installing Additional Memory

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