On Nov 14, 8:23*am, Daniel Prince wrote:
The motherboard and power supply of my computer are about 6.5 years
old. *I have been having problems with it lately. *It has been
locking up and rebooting itself frequently. *The most common problem
is lockups with a blank screen. *The other problems in decreasing
order of frequency a lockups with a frozen screen, lockups with
slanted horizontal lines on the screen and spontaneous reboots.

What is more likely to be the problem, the motherboard or the power
supply? *Is there any kind of test I could run

Dude, there's LOTS MORE parts in there than those two. You can
eliminate disk drive and software based on those symptoms, but
removing/cleaning/reseating RAM and removing/cleaning/
reseating cards and CPU (and check the thermal contact area with
the CPU heatsink, too) comes next.

Inspect for bulging or leaking-ooze capacitors while you do that.

Then find and run a memory check program, preferably from a hot-boot
CD.

If that doesn't locate the problem, find a spare power supply
somewhere
and swap it for a test period.