Hi everyone, I am new to the forums!

I had a power supply go out in my desktop. I replaced the power supply, but now when I turn on the computer is will not stay on. It comes on, acts like it is going to start, runs for 20-30 seconds, then shuts off! Any suggestions?? I am not sure where to even start.

This is my first attempt at doing much work inside a computer case, But I am pretty mechanicaly inclined at stuff like this.

Thanks in advance!

Remove the side panel and carefully re-seat all the RAM sticks and any add-on cards...
Double check to see if the 4 pin ATX power line is hooked up to the MBoard...I tried all these suggestions, but it is still doing it , It SEEMS to do it at diffferent lengths of time also. The last time I tried it, it made it all the way to the screen that displays the big windows logo... then complete loss of power.Are all of your FANS working and is the HEATSINK completely flush with the motherboard...all clips in place..yep...I keep double, double checking everything. Cant find anythingReturn the PSU for a replacement...
I hope it wasn't one of those $20.00 specials...they cause nothing but headaches.not sure if this was a good idea or not... But I unplugged the square 4-pin connector and hit the power button. The power supply fan turned on, and is constantly running without cutting off. I turned off the computer, plugged the 4-pin back in. Then turned the computer back on only to have it run for 37 seconds and completely lose power again.


The PSU I bought was the Diablotek PHD350 from tigerdirect. It was a cheaper ($25 I think). unit that I bought. It had a ton of good reviews but I know that doesnt mean that I didnt get a bad one. I will try a few more things before I mail this thing back in for replacement.I'm not familiar with that brand....When I get off work tonight, I have an old computer that I might be able to try its power supply in this computer if it has the correct hookups. Its an old 800mhz, does anyone know right off hand if it will be the old 20-pin connector and not a 24-pin like I need? If not, it will only take about 5 minutes to check it. SORRY I never came back and thanked everyone and updated this. I have been super busy with school.

First off, thanks for all the suggestions everyone!

I finally took my computer in to a guy I know that has a computer shop. The original power supply did die on me. The reason that he said the computer was just shutting off was that the PROCESSOR was over heating. I guess it all happened at the same time. He took it out, cleaned the "goo" off and put some new goo on, and its been going for two weeks with no problem now!

Once again, thanks for all the suggestions from everyone!Great news...and thanx for reporting back...