I replaced my Dell power supply with an aftermarket power supply. After I installed it and plugged the AC cord in and before I pushed the power on switch, a horrendous noise came out of the PC. It sounded like the hard disk was spinning like crazy. I unplugged it and reinstalled my older power supply and my PC started up OK. Could the new power supply be no good or could this be a connection problem?
It is an Athena Micro PS3 Hercules and supposed to be a Dell replacement. I tried to check if it was just the fan that I heard making crazy noises so I took the new PSU and plugged it in by itself and the blue light came on but not the fan. Should the fan start in this case? I did the same thing with the old PSU and the fan didn't come on when bench testing but it did come on once I installed it in the case and reconnected all of the wires.