Computer reboots spontaneously



I have had this computer for 3 years. About a year ago I replaced the
PS. Yesterday the thing just started rebooting on me spontaneously (
random time intervals 2 - 15 min, didn't matter whether I had loaded X
or not). I am not that great with hardware so I wanted some feedback
on my plan.
One thing I noticed is that I wasn't seeing CPU temperature in the
BIOS. I could see the motherboard temperature (94 F) but CPU temp
"unavailable".

Fans all seem to be working okay.

1) Recheck connections on the motherboard.
2) Get another power supply.
If I have a PS tester which voltages should I be concerned with? I
guess I'm really wondering whether low voltage to the CPU is causing
the problem. If I use a PS tester should I just assume that everything
is good if it lights up green. A friend has a PS tester and it doesn't
give outputs just green or red.
3) Memory test.
Anything else?
I really don't have much patience for this. I'm hoping that with 4
hours of work or less I can find the problem or decide to get new
internals.
Is there any software I could download that would give me diagnostic
information. I'm thinking about something that could log to the hard
drive and after it reboots I could recover it and try and determine
what is going on.

.



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