Could fried processor kill video?

Asrock G31m-s
April 14, 2009 at 04:11:15
Specs: Win XP X86
I am re-building a computer that was evidently hit by a power surge. Initially it would do nothing when you hit the power switch, but the power supply tested good. I replaced MB, and as a side effect replaced the RAM. Now everything appears to be turning up when you hit the power button, but there is no video, and no beeps because I have no PC speaker. I can hear the HDD spinning up, have case and CUP fans, power to NIC etc. I am using an asrock g31m-s MB with a 4gb dual channel 800MHz ram kit. The processor is a Pentium 4 3GHz with 800MHz FSB. I suspect the processor was fried along with the MB and that is what is causing my lack of any video. Thoughts from the Gurus?

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April 14, 2009 at 05:08:35
The PSU usually takes the brunt of a power surge. How did you test it? There are several voltage rails (+3.3v, +5v, +12v) necessary to power up a PC...if any one of them fails, the system will not boot, however, the PSU *may* appear to be healthy.

How did you determine the motherboard was the probelm? It definitely would be helpful to have a PC speaker. The beep codes can be invaluable in diagnosing a no boot situation. Get a speaker!

Strip down the hardware to the bare minimum. Disconnect all drives (HDD, optical, floppy), remove all RAM but one stick, unplug all external devices except keyboard then see if you can bootup & enter the BIOS. Try both the onboard video & a video card.

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April 14, 2009 at 12:07:09
My friend had the PS tested by the wonderful Geek Squad, so I am not sure what they used. However I plugged in a known good PS, and had the same results initially. No response to the on switch. Then I tested the switch with a multi-meter and it showed a connection when the button was pressed. I tried to jump the switch pins on the MB with a screwdriver and got nothing. ( all on the old MB)

I am about to switch his PS out with mine again, and see if I get video. It may be one of the rails like you said. Then I guess i will have to try it like you suggested. Good idea on the video card too. Thanks. I'll let you know if I have any luck.

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April 14, 2009 at 12:59:16
OK, I took a PS out of my computer that was working perfectly and put it in this one. Tried to boot. No video.

Put a PCIE video card in the PCIE slot, tried to boot. No video. made sure it was seated and plugged into PS. Also tried both video-outs on card. The fan on the card turned on, but no signal to the monitor. Also tried with additional monitor with same results.

Unplugged everything from the MB and PS except 12V MB plug, 24 pin connector, one stick of RAM, Processor fan, case fan, Keyboard, mouse and monitor. Tried to boot. No video. I know keyboard, mouse and monitor work because I plugged them into a different PC and they are fine.

Switched RAM out with other stick and tried to boot. No video.

I am thinking that the only thing left is the processor, but wouldn't it usually still have video, and just throw up some error? guess maybe not if it is not processing at all. I have never dealt with a dead processor, has anyone else?

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April 17, 2009 at 07:02:03
Found the problem, The bracket for the CPU cooler was shorting the bottom of the MB. Thanks for the help

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