It was dusty.
That was the first thing I did.
1st used a new 3 inch paint brush and dusted it.
Did not help.
I tried the Rainbow Vacuum on it,
all is clean and still acts up.
I am about to stick the mother board in a dish washer. (after I take out the battery.)
I allways desolder most caps on old junk Motherboards.
I have fixed many boards with old caps I saved.
I do not see any that has popped up.
all fans seem to work fine
no out of the ordinary sound from them.
I watched the CPU fan closely and it never seems to slow down.
I smell nothing when it shuts down.

I have 1 spare p4 power supply here. I will try that.
if that don,t work I will try a new CPU fan
and wash the board
thinks for the help.
I thought it is a heat issue
glad to hear you guys pop in and confirm it.