Need help troubleshooting a system overheat

ceruleance

Honorable
Apr 18, 2013
1
0
10,510
Hi All,
I could really use some help troubleshooting a system failure I experienced recently. My system had been running perfectly fine for 3 years. The system was accidentally placed too close to a heating register which I strongly suspect caused the failure. The system was just sitting idle when I heard it turn off. When I try to turn it back on this happens:

All the fans and lights come on on the motherboard and case (the fans seem to be running at a fairly high speed, higher than when the system is normally at idle)
I can hear the the hard drives spin up
There is no beep from the system speaker as far as I can tell
There is no video at all
The system does not appear to be booting at all
When I press caps lock/num lock on the keyboard the respective indicator lights do not light up

Here's what I have tried as far as troubleshooting:
1) I have two sticks of memory installed, I tried each individually with no change
2) I swapped the video card with no change
3) I swapped the CPU for an identical chip with no change
4) I sent my motherboard to Gigabyte and received it back with a note saying that it tested fine.

I would appreciate any help you guys can provide me on diagnosing the problem. It seems like the power supply is the only thing I haven't checked yet, but seeing as all the fans and hard drives spin up it seems unlikely that the PSU is the issue? Is there a way to test it without swapping it out for a replacement?

Thanks in advance for your help, I am really stumped at this point!
 

TenPc

Honorable
Jul 11, 2012
2,471
1
11,960
Try reseating the mouse and keyboard cables prior to booting up or even use different usb ports.
A power surge could affect the usb ports in use at the time, maybe.

It might be that the bios has defaulted and that your video out has reverted to the onboard out port.