It really sounds like it'd be either the PSU or the CPU. The lack of a POST is suggesting a CPU issue, and when the CPU fails, it shuts down the system. This would also, obviously, lead to the vid card not operating. O_o
Second up is the PSU. It could also be responsible for a power-down, especially if it's faulty. You should check your mobo and the rest of your parts with a different PSU before moving on. You'll want to be careful proceeding if the PSU could be at fault, because it could fry the mobo. o_o This happened to me before.. and it really, really sucks.
I'd say those are the two factors most likely to be involved. For the CPU issue, double check that you have ample heat-distribution measures installed (heat-sink, that putty stuff, etc).
Good luck with that! Keep us updated!
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