tempest
Veteran Member
I have an IBM 5150 that had a failing power supply, so I got a new one for it. It's not an original 5150 power supply, but an XT style one by Power Tronic. It has the P8 and P9 connectors and they're the correct style for the 5150/XT so I figured I was good to go. When I plugged it in the speaker emitted a continuous tone so I shut it off and tested the voltages. All the voltages are correct and I know I have it plugged in correctly (black ground wires towards the center). So what could the problem be? The system is ok because when I plug the old failing one in it still boots up, so it must be something about the new power supply it doesn't like. Any ideas?