> New MB decided it didn't want to boot anymore. Rebooted after adding 
> software: System would beep, The MB logo would show, screen would blank, 
> system would beep, the MB logo would show, screen would blank ...

Didn't you mention that the PSU you were using was a bit on the low side for 
your hardware?  Maybe the CPU and GPU combination all firing up to max at 
boot is enough to reset the PSU?

If you haven't already boxed it up, maybe you could try with an older 3D 
card that isn't as power hungry...

Just an idea.

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