Computer Power Supply

I have a compaq computer power supply I salvaged and want to use.
However I can't figure it out. I know you need to keep a load on the
5V line to get it turn on and to output the other voltages. I found
the gray wire to ground does the trick, the fan comes on and the
other voltages are there. However as soon as I apply a load it kicks
out and I have to shut it off wait a couple of seconds and turn it
back on. The load is 12V .22A so it can't be that. I have put
various resitances across the 5V from 0 - 450K ohms. Same result.
Any ideas.


Part No 286008-001 Model PS-4151-6CF
Output
5V 17A
3.3V 6A
12V 4A
5VSB 0.02A
-12V 1A.

165W Max Output