Problem: When I press the power button on my computer, the fans start spinning, the harddrive STARTS spinning, then 2-5 seconds later, it all shuts off again.  screen doesn't even flicker.  This started happening after I took my video card out to replace the fan, then put it back in.  I have had it in and out a dozen times in the last few days with no problems.  Finally it's fixed, and this is when it happens.  I have tried starting it with the video card, without the video card, with the old fan, with the new fan, same thing.

Specs: mother board is an ABit-KD7, video card is NVidia GeForce4, power supply is 10A 12v.  I have 2 HDDs, one 80GB, one 250GB, both WESTERN Digital.  One 512MB RAM chip.

Any suggestions as to what could be causing this and how I might be able to fix it would be apprecated.  I was LOOKING to upgrade soon anyway, but I'd rather not have to start from scratch right now.

Thanks!Ok, try this, nothing but the power supply, cpu INSTALLED on the motherboard, plug the power cord in boot computer and wait. If the computer still shuts down then its either the psu, motherboard, or cpu at fault. If the computer stays on then shut it down and do the following, start to add one thing at a time, (remember to shut down before you add each thing) monitor, memory, videocard, harddrive, cdrom....ect

You need to see wich thing it is you are reinstalling, that is causing the problem. So each time you add somthing, leave computer on abit to see if it shuts down.

Let use know how you go on.