On 1 ene, 15:53, n8ball wrote:
Hello!

I have a problem with my Optiplex 745 power supply, model H275P-01.

I printed out the ATX 24 pin pinout and whats odd is when I short the
pins to turn the unit on, its turns on ok.

I read the voltages out and I get what is in spec when not plugged
in...

However, WHEN i plug in just the ATX aux 4 pin connector (for the chip
extra power) the power supply works fine, but when I plug in the main
24 pin connector it stops....

My questions:

Do you think the power supply needs recap or the motherboard is at
fault here?

I opened the power supply but didn't see any leaky caps...

I thought it would be more obvious which caps are bad but it looks
like i might just have to recap the whole supply!

What would cause the power supply to run fine when not plugged in, and
give the right volts out, but not work when plugged in?

I assume its some bad caps in the supply itself but thought I would
ask on here to see if any one has dealt with somethig like this before.

You could have a short in your motherboard or add-on cards. When an
output is shorted most power supplies will refuse to start. You can
test with another power supply or another PC to determine where is the
fault.