Computer Restarts Randomly when I do anything that actually matters...

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Hegelian:
I ended up choosing the Corsair VX450w high-efficiency unit for Reggikko's PC. It's a new model on the market, built by Seasonic, a brand well-regarded in Europe. Although new, it is getting quite favorable reviews from sites that do proper, thorough testing with a gaggle of specialized test equipment. The specifications are good, especially for efficiency, although not quite a match for the PC Power & Cooling unit is it replacing. This is the first non-PCP&C power supply I've bought, but the current model (Silencer 470 ATX) is not as well-spec'ed as the one that is being replaced (Silencer 400 ATX); and while a pioneer in the high-quality PSU field, PCP&C seems to be losing some of its edge in the engineering and construction area, at least in its low-end models—the Turbo-Cool 510 ATX in my PC is quite a bit more impressive than either of the Silencers or the Corsair, albeit at more than twice the price:

Turbo-Cool 510 ATX:
+5V @ 40A
+12V @ 34A/38A
-5V @ 0.3A
-12V @ 2A
+3.3V @ 30A
+5VSB @ 3A
continuous = 510W
peak = 650W
Regulation:  1% (+3.3, +5, +12) / 5% (-5, -12)
Ripple:  0.5% (p-p)
Hold Time:  20ms
PG Delay: 300ms

Corsair VX450w:
+5V @ 20A
+12V @ 33A
-12V @ 0.8
+3.3V @ 20A
+5VSB @ 2.5A
regulation unspecified
efficiency up to 85%
active PFC

As a comparison, the Silencer 400 ATX that is being replaced due to start-up problems has these specs:

+5V @ 40A
+12V @ 20A
-5V @ 0.3A
-12V @ 1.0A
+3.3V @ 40A
+5VSB @ 2.0A
continuous = 400W
peak = 450W
Regulation: 3% (+3.3, +5, +12)

If I had gone ahead and tried to fix this problem last year when I bought the motherboard I installed earlier this week (thinking that was the source of the problem), the Silencer 400 ATX would have still been under warranty.   :(

Oh yeah, now I need to buy a new UPS to replace the 14-year-old APC Back-UPS 400 it's been running on.

bekka:
All fixed.  I didn't break anything while changing it but had to have help putting is back in as it kept pulling away from the screws.  I managed to get The Sims installed and played for a bit without any problems. 

Thanks so much to all of you for the help.  I'm not afraid to admit I would have been lost without you all.   ;D ;D

Rose Outlaw:
Well done :)

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