Why would a PC crash after POST or straight after booting up?

From my personal experience (I've built a few systems, to include a Core i7 one), this has happened once. I'm sure there are multiple possibilities, but I'll stick with what I've encountered. Since this shutdown happens so early, ensure your CPU fan is turning on.

If the power isn't connected firmly, it may have lost contact when you moved your computer. Motherboards are pretty smart and will shut your system down if the CPU is getting too hot. For me, when I closed the case I pulled out the power connection for the CPU fan.My computer made it almost to windows before shutting down the first time, and after that would shut down faster.

Eventually, it was shutting down immediately. Once I found out the problem and re-connected the CPU fan, everything was fine. Turns out you REALLY need that fan to dissipate the heat.

I was just happy the motherboard/CPU protected itself from the stupid user rather than melt down. Good luck.

I have actually heard this problem several times lately with the core i7s, it could be exactly what jth007 was saying, or it could be the lack of thermal paste on the processor/heatsink. The stuff that comes preapplied on most heatsinks is terrible and I always suggest using something better. If you're cpu fan is working but you still get the same results try using some extra thermal paste.

Here's a tutorial on how to apply it. hardwaresecrets.com/article/274.

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