I am putting together a server and it will not power up. I checked the power supply on another machine, and it works fine. Oddly enough, if the clear cmos jumper is in the open position, the PSU and CPU fans come on. The motherboard is a Tyan S5382, 16 gigs of ram, 1000w Silverstone PSU, onboard video, onboard sound. 1TB WD HD. Any suggestions?