It's 2:25p.m.That Means My New Intel iMac is Going to Crash!  What's Up?

My father-in-law recently bought a new 17 inch iMac with a I Gig of Ram, running at 1.667 mz, the whole nine yards. Nice machine. He bought it on my recommendation. It worked good until it started crashing. He put up with it for a while. I told him he didn't have to do that. So he took it back to his Apple dealer. They ran diagnostics and then determined it was the logic board. So they replaced that. He brought it home and it continues to crash, screen going dark and then it asks him to restart. The bizarre part of it all is it happens mostly at 2:40p.m. to 2:50p.m. almost on clockwork. What's up with that?
He's calling the Apple dealer tomorrow. They surely will tell him to bring it back in. Anybody have any ideas? This is a vexing problem, one that shouldn't be happening on a new machine.
iMac G4 Flat Screen   Mac OS X (10.4.1)  

If it really always happens about the same time, a likely culprit would be a power problem caused by someone turning on a cooking device or heater at that time -- and causing a voltage drop or surge in the same circuit.
Is your Dad noticing any lights dimming?
Another alternative, if it is connected via wireless, would be some kind of radio interference caused by someone nearby who is on a regular schedule with using a microwave oven, cordless phone, or wireless computer.
Again, it would be useful to know what programs you Dad is running at that time.
And the timing might just be co-incidence, in which case the range of possible causes is a lot larger.

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