My computer powers on but doesn't POST and I get no video?

[aliensquale]

I turned my computer on the other day, and I get no video output and the computer doesn't sound like it POSTs either. It just sits there with the fans spinning doing' nothing. I tried clearing the CMOS, taking out the memory, disconnected each PCI card, the agp video card, etc. and the same thing keeps happening. I am not sure why this is happening and what I can do to get it to work, any suggestions?

ps.-> this started happened after my computer unexpected turned off one night. When I tried to turn it on, the power would not come on, so I unplugged the power cord from the back, left it like that overnight, then the next morning plugged the power cord back in, pressed the power button, and the power come on, but now it just gives me no video output and doesn't sound like it POSTs.

What could be the matter?

I have a P4 2.8ghz HT processor running on an Abit IS7 mobo, with Kingston HyperX memory (1 gig).

Thanks

 

[boomerang]

Can you get a hold of another Power Supply to try? That would be my first step.

 

[Woofmeister]

The circumstances ("this started happened after my computer unexpected turned off one night. When I tried to turn it on, the power would not come on") suggest something catastrophic occurred with respect to either your MOBO, RAM, CPU or all of the above. The fact that your case fans turn on suggests that the PSU is not the source of the problem. The only way to diagnose the problem is to swap in compatible parts that you know work. Also, make sure that your ATX power connector is firmly seated in the socket.

 

[ExpertNovice]

Originally posted by: Woofmeister
The circumstances ("this started happened after my computer unexpected turned off one night. When I tried to turn it on, the power would not come on") suggest something catastrophic occurred with respect to either your MOBO, RAM, CPU or all of the above. The fact that your case fans turn on suggests that the PSU is not the source of the problem. The only way to diagnose the problem is to swap in compatible parts that you know work. Also, make sure that your ATX power connector is firmly seated in the socket.

In my case it was the PSU, (not getting -12v but fans worked), Video adapter, and MOBO.

A diagnostic card pointed out the PSU problem but once it was replaced it did not help. It got stuck on a floppy drive read problem. The shop had to test all components to figure out what all was wrong.