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Originally Posted by punky
Help!
I've tried to build my PC (Pentium D 805, Gigabyte Intel 945P board etc) and it won't POST or beep.
I put in the processor, heatsink, memory, graphics and did the case connections (power switch, etc).
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What about the PSU?

No seriously, the extra 12V connecter is connect alright isn't it? An is it a 20 or 24 pin ATX connector (not sure which board)? Take out the motherboard and check the motherboard tray for an extra mounting or something you may have screwed in that could be shorting things.
Edit: What Zingle said then!