OK I have a GA-K8NF-9 Gigabyte motherboard Athlon 64 3200 CPU 1GB memory Antec 450watt PSU. Everything was going fine, I shut the pc down at night then the next day I go to turn it on and NOTHING. Naturally I thought it was the PSU, so I took it out and took it to the shop where I had purchased it. They hooked it up to a tester and said it was working fine. I seen the fan spinning and it looked good. So I'm thinking something must have been loose in my pc. I hook the PSU back up and same thing. Nothing happens, fan doesn't spin or anything. I've tried different cables, tried using the reset switch instead of the power thinking it may have been the switch, I even tried just using a jumper instead of connecting the power switch cables on the front of the box so in theory when I flip the switch on the PSU it should come on. Still nothing happens. The fan on the PSU doesn't even spin. Does anyone have any ideas??