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Computer boots then restarts - no video output

Stg-Flame

Diamond Member
First off, this is a pretty old gaming computer I built for my mom back in 2008. I'll list what specs I know:

Motherboard - ASUS P5Q SE Plus
Processor - Unknown Intel Processor
PSU - Corsair TX 750W
RAM - Mushkin XP2 6400 (4GB)
GPU - eVGA GTX 260

To start, when I turn on the computer, it fires up (all components seem to be working fine), then everything shuts down for three to four seconds before starting back up again. The main problem is no video signal coming from the GPU to the monitor but after testing her card in my old rig, the problem is not her GPU.

I'm not too sure on the details of what happened, but she said she shut it down for the night, woke up the next morning and found it running. The PSU was plugged into the wall socket instead of a power strip so my first thought was a power surge fried her mobo, but the only things that wouldn't work were the video (no video input detected via monitor) and her keyboard wouldn't work. Once I got it to my house, I swapped some parts around to find her GPU isn't fried as her card worked in my computer, although her keyboard is completely dead. This all leads me to believe her motherboard is gone, but I would really like to know if there are any other troubleshooting tips I can try to get her computer to work before I go ahead and build her a new one.

Any information is appreciated. If I can just figure out how to get a video signal to my monitor, I can hopefully troubleshoot the rest of the problems from there.

Also a side note (not sure if it's useful), but the P5Q has a little green indicator light on the motherboard that turned red when I initially built the computer due to bad sticks of RAM. However, the light is still green.
 
That worked! Thanks a lot.

However, now I have two questions:

What could have caused this and how do I prevent this from happening again?
 
Since you weren't there when it happened, that is going to be hard to say. Given its age, you may want to repkace the CMOS battery.
 
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