I have a home pc with an Intel D865GVHZ motherboard and 3.06ghz Pentium CPU (running linux). After a recent power outage, the PC didn't come back on. After replacing the power supply last night, everything seemed to be working fine. I booted and logged in and looked around and everything was fine. I put the cover back on the case and carried it upstairs and hooked it back into the network. But when I turned it on, the PS fan would come on for 1-2 seconds and then every thing shut off. I tried numerous times and that's all that would happen. Tonight I opened up the PC again and eventually disconnected everything except the PS from the motherboard. So now I have a motherboard with only power connected to it. Still the same thing when I turn on the power, it runs for 1-2 seconds and the turns off. But, if I take out the memory, it'll power up and continue running and beeps some number of times. I assume that the beeps are error codes that there is no memory. I ensured that the memory is seated correctly, and tried only one stick and even put in other memory that is brand new. If there is memory installed, every thing powers up for 1-2 seconds, if there is no memory, everything runs as long as I leave the power on.

Start with a voltage test of the PS. There are plenty of site that show how to jumper the ps so it will start. Be careful! If you are in any doubt take it in for service somewhere. The normal start up test is one hard drive attached and check all voltages. Then start connecting parts one at at time. The specs for the PS should be very close to each voltage. Most PS's offer on overcurrent protection. That may be doing it, a low voltage could make the ps think it is under too much draw. As you say it might be the ram. I read it wrong and answer it wrong too. So get off my case you goober.

I understand your point, but it won't start even with nothing attached. If I have the motherboard with memory, it won't run more than 1-2 seconds, even with nothing else attached. If I take the memory out, it runs until I turn it off. Even new memory didn't help. I guess I'll figure out how to do a voltage test of the PS, but beyond that, I wonder if something on the MB was messed up during the power outage. Tho it did work fine for one evening after I changed the PS. I should probably take out the PS and take it back and exchange or let them test it.