How To Test A Dell Power Supply. Based on what youve said it sounds like the server is only using PSU 1 and not both depending on the hardware inventory screen I would remove. Your power supply should be shut off.

Many older Dell PCs contain a propriatary powersupplyThe connectors on these powersupplies look like and fit standard ATX. If the LED lights up after you press the BIST button on the computer then it is working. Look for the Diagnostics option in your Dell boot menu.
Press and hold the self-diagnostic switch on the power supply -.
Hi all I am thinking of using an old Dell power supply PS-5201-1D as a power supply for testing parts of the rover I am going to build. 6 Restart your computer to see if the problem is resolved. If you have physical access a visual verification to see what the PSU diag light shows is also another check. Using the button on the power supply you can run the self-test.

