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Monitor continually loses signal from video card

WhyteRyce

Member
I built a computer for my friend over 6 months ago and he recently started having problems with it. After the computer has been on for a minute or two, all of a sudden his LCD will go black and inform him that it's not getting a signal. The computer hasn't crashed because I can still hear sounds from whatever he was doing in the background and I can shut it down using keyboard commands. As soon as I restart the computer, the picture comes back up.

He has an ATI 9600pro. I originally thought his video card was bad because the VPU recovery tool would sometimes kick in and say that it was getting no response from the video card. I swapped it out for an old Geforce 5200 and had the same problems. I ran memtest and the memory came up fine. He's got a 350W Antec SmartPower power supply, which I thought should be enough for an AMD 3000+ and 9600pro.

This just started recently. His computer worked fine for the previous 6 months and he mostly just typed word documents on it. When I was gone on vacation, his computer crashed and (supposedly) would either not turn or not boot up. His friend took out the CMOS battery and supposedly the computer started working again. But that's when the current problem started happening. I thought his friend might have changed some settings in the BIOS, but resetting the defaults did not help. I also tried his LCD on another computer and it worked fine.

Any ideas? Thanks for your help
 
I checked the power supply voltages in the BIOS. The 12V rail is supposedly at 11.84V, which seems kind of low. Is the power supply bad and the cause of these problems?
 
It does it with the VGA and DVI out.

I don't know what the video card temps would be because I have no way of reading the temperature monitors when the screen goes black. I don't think overheating is an issue as the computer has the same problem with 2 different video cards
 
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