Power up problem

[Schus]

I've just put together a P4C800-E deluxe. Its been running for about 2
weeks with no problem. This am I went to turn it on and nothing. No post,
humm or anything. Ther is a light on the motherboard that is lit. Even
though the power supply is only 2 weeks old maybe thats the problem. I
checked the power switch for a break in the line using an ohm meter and all
is okay. Any other suggestions? How could I check the power supply?

 

[Paul]

I've just put together a P4C800-E deluxe. Its been running for about 2
weeks with no problem. This am I went to turn it on and nothing. No post,
humm or anything. Ther is a light on the motherboard that is lit. Even
though the power supply is only 2 weeks old maybe thats the problem. I
checked the power switch for a break in the line using an ohm meter and all
is okay. Any other suggestions? How could I check the power supply?

Info on ATX can be found here:

http://www.formfactors.org/developer/specs/atx/atx2_1.pdf (see page 19)

To start the supply, disconnect all loads and connect PS_ON# to COM.
The power supply will run as long as they make contact.

All power supplies have some minimum load specified for them. If the
supply is run with no load, the voltages can be off. I use some load
resistors to draw the minimum load when testing a supply. But a simple
test is to just check to see if the power supply fan is running.

If you decide to give up, and pull the board out of your case, you
might also inspect the bottom of the motherboard for this problem.
It is the post by "mechabouncer" in the following thread, and applies
to the P4C800 Deluxe. Since you have a different model, it probably
isn't this problem, but have a look anyway:

http://www.techsupportforums.com/showthread.php?postid=41955

http://koti.mbnet.fi/~nightops/eki/DSC00249.JPG (lower right corner)

HTH,
Paul

 

[DaveW]

The best way is to try temporarily installing another PSU that you know
works and that has adequate Wattage available for your system.

 

[Schus]

Thanks for the response. I had the power supply checked out it was working.
When I got it back I hooked up the power wires to the motherboard with the
power supply outside the case. Turned on the power serveral times and it
worked. Fixed? Wrong! Without detaching the power cables I attached the
power supply housing to the case, tried it again and it didn't work.
Remover the power supply from the case leaving the cables attached and it
still didn't work. Revoved the motherboard and inspected the soldier
connection but didn't see anything that stood out as a problem.

Since I'm still not sure if its the power supply or not I guess the only
other thing is to install a new one. If it is the motherboard woud this act
this way?

 

[Schus]

Turned out to be the power supply. Installed a new one and it works fine.
Thanks to all