I am trying to replace a PSU in a Compaq Desktop Presario 5030. The Current PSU is a Mitac MPU-110REFP (Compaq Part 319235-001).
I have tried installing a Bog Standard PSU but have encountered the following problem.
It fits, and the holes line up. However the power supply from the PSU to the motherboard seems a bit strange. The new PSU has a single ATX connection, however the Compaq motherboard has two separate sets of pins for the power!
One set consists of 3 x black, and 3 x orange wires. The 2nd set consists of 2 x red, 1 x green, 4 x black, 1 x blue, 1 x yellow, 1 x purple, and 1x grey wires.
For a picture of the motherboard connections click here
It does have an ISA slot and the power rating is steady state 110 watts. If it is then it is quiet an old machine and probably needs an AT power supply. Can you take a full view picture of the motherboard and post it?
Just read your first post the Original power supply that you have is a AT type the one you got is ATX they are not compatible you need a AT power Supply. You will more than likely have to get one from a Computer Fair as they are out of date