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I just bought a brand now asus p8z77 motherboard with a intel 3770. Its currently not booting - the system powers up for half a second and then powers down, and the CPU error light shines. I've tried switching ram between slots, switching PSUs, updating the bios (which can be done sans processor or ram on this model).

Power:

The 8 pin power connector is definitely in place correctly, and I've tried swapping PSUs between a new seasonic m12, and a known good cheapie PSU

Ram:

Ram is in the recommended slot for single stick operation, and tried swapping between the two sticks of DDR3 I have.

Processor: Its installed correctly as far as I can tell, no obvious bent pins on the motherboard.

At this point I'm guessing I'll need to RMA something. Are there any 'definitive' tests I can try, short of swapping CPU and motherboard that would let me know it is the CPU? Can I actually trust the error light on the motherboard?

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    Unless you try a different CPU not sure what else you can do.
    – Ramhound
    Dec 11, 2012 at 16:05

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I ended up bringing back the board to the retailer, who was nice enough to test it for me, and found that pins (retailer found 2, distributor told me one) were bent - they're really small and I apparently missed them on a visual inspection.

Ended up RMAing the board (and suprisingly, asus's local distributor immediately swapped it for a new one). Got them to install it, and the system runs fine.

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