Missing wire from new PSU....

[wilson502]

Ive been having problems with my cousins computer with not posting or beeping whatsoever. I stripped it down to the CPU/HSF and still doesnt beep. Im thinking, theres a missing wire on the 20 pin PSU. Its pin #18, and is the -5vdc wire, which is the white wire and this psu has no white wire. So is this is what is causing this or no?

 

[Kain]

All -5vdc is used for is ISA slots, so it shouldn't be the problem.
That is, unless his still has ISA slots.

 

[Ice Czar]

and its been eliminated altogether from the latest spec (ATX12V v2.0)