Dell PowerEdge 1800 (tower), non-redundant power supply. System will not boot, no post or bios messages, fan on the motherboard does not come on. However the fan in the power supply does come on. The power indicator light on the front blinks which indicates that power is available to the system but the system is not powered on. I took the power supply out and did the paper clip test and the fan in it does come on so I am thinking this is not a power supply issue.
I have unplugged everything from the back, re-seated the memory, the system is not overheated. Any other suggestions?