I cleaned out all the dust and tried again. It still was surging with the fans speeding up and slowing down. It was like the voltages were coming up and down without getting up high enough to boot the computer.
I replaced the power supply and now all I get is the green light on the mother board next to the memory cards. When I push the power button I don't get anything.
I pulled the leads off of the MB and tested the power button with my meter. The button is good. I also have just under three volts at the pins.
By the way, can you give me a diagram of the front panel pins? I have not found one. The power button, power LED, and HD LED are all wired with two pin connectors that are not keyed. You can put the three of them on the pins any which way. I don't think that I have them wrong, but would like to be sure.
Printed on the MB is this,
HD LED +1 -3
PWR LED +2 -4
RESET 5- 7+ (Why the changed order? & there's no reset button on this computer.)
PWR ON +6 -8
There are nine pins with a little triangle pointing at one and a 2 next to another.
The pins on the MB look like this:
Thanks for anything that you can tell me.