Re: I upgraded My CPU

Presuming you are correct about temperature issues, the processor/cooler are seated correctly, RAM is seated correctly etc:
Check that the motherboard supports your new processor. With ASUS motherboards you should also check their user boards to see if anyone else has reported similar problems with that combination of mobo and processor.
Alas, while ASUS makes generally high quality motherboards, there can be inexplicable glitches between certain processors and certain mobos that should be compatible and BIOS fixes do not correct. For example I have one machine with a late model AMD mobo that will not run any supposedly compatible X2 processor smoothly but works "phenomenally" with PhenomII, and many users on the ASUS support boards reported the same issue with that mobo.
Make sure that your BIOS settings are generic and not overclocked in any way, shape or form for the proc or the ram. Software test the RAM.
You may need to roll back or reinstall the BIOS: again my experience with recent ASUS mobos is that while they make upgrading the BIOS easy the new BIOS may not install completely or correctly, generating all kinds of stuttering or intermittent problems.
Take out one of your videocards: SLI/Crossfire can cause all kinds of problems so make sure you can run one card stably before you try two.
Inspect to make sure nothing is shorting out the mobo since you installed the new processor/cooler.
If the settings are all correct and you cannot boot stably with one videocard try upgrading/reinstalling the motherboard drivers.
One way to differentiate hardware and OS issues is to reinstall the OS on a spare drive in that machine, take out your current C drive first. Clearly if you can install a new copy of the OS and it runs smoothly something is amiss on your old one.

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