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monitor has stopped working

June 27, 2009 at 13:21:12
Specs: Windows 95 & 98

I'v been working on a Compaq Presario 972 desktop computer for a freind of mine. She brought it over and we pluged it in and it lit up the screen,but it was having trouble, it needed the redgestry cleened or something. I took the main baord, modem and the power supply out and blew the boards and ps out with my compresser. I put the computer back together and pluged it in I could here the hard drive start and the light on the cd rom lights a little, the fan turns and the light for the power lights up, but no monitor. I'v tryed everythin I could think of to get it working. I'v tryed 98 and 95 boot and startup disk and 98 se, 98 ug and 95 cd roms. I'v checked all that I had taken out and cleened. I'v put defferant drives in it (cd, fl, hd) and nothing it dosent even beep. I'v tryed differant software like ubuntu red hat and steel the same thing. I even tryed clearing the cmos. I can't figure what it is can any body help with some sugestions on where to go next. It has 64 mb of ram, 2700 caviar, I don't know what the cpu is. thanks der

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#1
June 27, 2009 at 21:45:28

That fact that LEDs light up, and fans and drives spin can leave the impression the computer it working but something is wrong with the monitor. That's not necessarily the case. It only means the power supply is putting out 5 and 12 volts. But obviously it's not going to hurt anything to try another monitor, just in case.

Likely either you damaged it when you were disassembling or reassembling it, it's shorting somewhere or it's not put together right.

Try temporarily disconnecting all the drives and removing all the cards except video. Make sure the video card is firmly seated. If possible try a different card. Then see if you get the compaq screen when booting up. If so then one of the disconnected devices must be the problem.

If no luck there then see if you can remove the motherboard and connect it to the power supply outside the case, thereby eliminating any shorts.

Did you remove the cpu when cleaning? If so make sure it's firmly seated with no bad pins.


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#2
June 28, 2009 at 09:59:53

When you get no video, usually there's nothing actually wrong with the monitor or the video adapter - something else is wrong. It's easy to test an external monitor by trying it with another computer.
(I'm assuming that if this computer has both an onboard video port and a video port on a grahics card in aslot, you have it plugged into the card - in almost all cases, installing a video card in a slot disables the onboard video - however, in that case the computer should still boot okay in most cases.)

For some suggestions about what you could check for, see response 2 in this recent Topic,
http://www.computing.net/answers/ha...

starting at

Probably the most common reason a computer won't boot ....
........

In addition, rarely, sometimes you have the bad capacitor problem.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:
http://members.datafast.net.au/~dft...

What to look for, mboard symptoms, example pictures:
http://www.badcaps.net/pages.php?vid=5
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
http://www.badcaps.net/

Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:
http://www.halfdone.com/Personal/Jo...


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