can u take out the motheboard out off case then place it on a non metal surface, power it up with only m/b, cpu, gpu, memory to see if it post's "ps plug in mouse, keyboard, monitor and power connectors. if that works mount it back in CASE, then get it to post if works, attach HD to see if post screen shows that as well, if so attach cd drive, floopy! etc with power off etc then continue, try this and post back.