Cabinet PC won’t power up. Ideas?

[nipsmg]

I’m making some progress in my cab and went to mount my of inside the cabinet today.  The PC was working in the house.  Brought it out the the garage, mounted the PSU and Graphics card to the wood and mounted it in the cabinet.  Fired it up and....  nothing.  No post, no beeps, PSU doesn’t even turn on.

I was convinced it was the PSU until I found out you can bridge pin 16 and a ground pin.  Did that and PSU spun up.  Suggests motherboard.  The only thing that I can think of that happened is that the board it’s Mounted to slipped while I was mounting it in the cabinet and it hit the bottom of the cabinet somewhat hard. 

Any ideas (click to enlarge):

[Thenasty]

just guessing here, I don't know where you getting your power from and what cabinet you have but, many cabinets have interlock switch. This device turns off any electricity once you open up the backdoor.

Maybe that is your case. Did you try powering your PC outside the Cab ?

[nipsmg]

The pc is outside the cabinet. 

I just plugged in another motherboard to the PSU and it fired up.  So it’s something at the Motherboard.  I just reseated the ram, tried one then the other ram module, reseated the processor.  Nothing. 

Looks like the motherboard is shot.  I just wish I had any idea why! 

[Malenko]

basic PC trouble shooting, remove all the peripherals . No KB, no mouse, nothing in the USB ports, no ram, no hard drives, use onboard video etc
Check all your cables (those extra 4 pin connects near the CPU will prevent POSTing)

if it POSTS, add one thing at a time till you find the culprit. 1 ram module in the 0 pair to start etc etc etc

[jdbailey1206]

 

[nipsmg]

It was a short. Reseated everything, tried one component at a time, nothing.  Visually inspected to and bottom of board.  Looked ok but dusted thoroughly with compressed air and put it all back together.  Fired right up.

[newmanfamilyvlogs]

better than fried right up. I've had a few boards do that due to errant bits of metal.

[Malenko]

Its not "try one component at a time", its start empty, if it doesnt boot its not the components preventing booting its the motherboard. You wouldn't / shouldn't continue to test everything one at a time if it didnt post.
If it posts, you keep adding things till you find out what is broke, thats all.

Glad you got it sorted but I just wanted to explain a little better why things are tested like that.