No POST

[sab0900]

I know that the most likely cause of the fans spinning for a second and then nothing is a misplaced mounting post or other metal grounding the motherboard, but what are the unlikely causes? I have this symptom and my motherboard is not being grounded. I have unplugged everything but the CPU's and the RAM, tried different known good RAM and CPU's, tried 3 different known good PSU's. This was a functional system before I changed the case. No other config or hardware changes. Very carefull about ESD and making sure that the motherboard is not grounded. Will a zapped motherboard exibit this symptom? I have been building computers for a number of years and this has got my stymied.

 

[Zorg]

Take the mobo out of the case and see if it will POST on a piece of cardboard. If it POSTs its shorting to the case, if not the mobo may have gotten damaged with all the switching stuff around.

 

[Zorg]

Well, did it POST?

 

[WazzaUK]

Helps us if you post some hardware details. CPU/motherboard/PSU/video card/memory etc.

Normally un-connected power connectors to motherboard or underpowered PSU's.