Nibble,
I have tried running the ram at 1066Mhz and while my ram does run stable, I still suffer the boot problems.
I can't shake the feeling that this might be somehow BIOS related. I just re-flashed 0402 and I'll see how that goes - though I'm not expecting miracles.
I'm also only running with one stick of ram for testing purposes.
The board was able to boot after flashing w/ ezFlash, and also booted after various BIOS setting changes. It did however fail to reboot after I disabled C1E, SpeedStep, Venderpool Tech., etc... on the CPU page and saving.
I was able to get it booted back up after pressing the reset button (only once this time

) and the POST reported that my overclocking had failed (not that anything really was overclocked).
The reason I suspect it may all be BIOS related is because when I first setup the P5WDH, it had a similar boot problem that was eventually fixed with a BIOS update.
The only thing is that I haven't heard of too many people complaining about boot issues with the P5K-P. Most of the complaints seem to surround the SATA-II problem.
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