I'm looking for some troubleshooting advice before I tear something apart.
I have an SGI O2 that just walked in the door. If I plug it in, the fan spins up and power light comes on for about 1 second, then it shuts itself off. After that it is non-responsive unless I pull out the power cord and let it sit for a few minutes. After that I can get it to repeat the same performance.
My first thoughts are that there's something wrong in the switching power supply, likely capacitor related, since it powers on at all. The switching power supply is my prime suspect since I've seen them do this type of thing when there's either no load on them or there's something wrong in the feedback circuit.
Opinions, please? Normally I'd just tear it open and start replacing capacitors but this little monster has a stack of boards in the power supply.
I have an SGI O2 that just walked in the door. If I plug it in, the fan spins up and power light comes on for about 1 second, then it shuts itself off. After that it is non-responsive unless I pull out the power cord and let it sit for a few minutes. After that I can get it to repeat the same performance.
My first thoughts are that there's something wrong in the switching power supply, likely capacitor related, since it powers on at all. The switching power supply is my prime suspect since I've seen them do this type of thing when there's either no load on them or there's something wrong in the feedback circuit.
Opinions, please? Normally I'd just tear it open and start replacing capacitors but this little monster has a stack of boards in the power supply.