My UD5 is refusing to boot, in an issue which I believe to be distinct from the normal cold boot issues these boards suffer from. I have some CAD work due in halfway through next week which I do not wish to do on a netbook, so assistance in getting this running would be much appreciated. At least I'd like advice on whether this is board, cpu or ram.
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Symptoms
With dimm slots 1,3 or 5 occupied, the board does not post. With dimm slot 2,4 or 6 occupied, the board posts, will allow access to the bios, but reboots shortly after. Specifically it makes it partway through the bootloader then gives up and reboots, this cycles indefinitely.
With multiple slots occupied, as long as one of the occupied slots is 2,4 or 6, the board posts then reboots much like before. With multiple slots occupied, none of which are 2,4 or 6, it refuses to post.
LCD poster cycles through numbers rather swiftly. It seems to settle on 96, then on FF before rebooting. If no stick is in slots 2,4,6 it sits on 69 for a while, changes to 6F briefly then flickers through a few to come back to 69. I have a suspicion the time between changing from 69 to other numbers is approximately the same as time between reboots when it has ram in slot 2,4,6.
The manual suggests 69 is L2 cache, 96 is loads of things and FF is try to boot. This leads to fears that my processor is dying, which I'd really rather it doesn't as common knowledge is processors don't die, making rma a challenge. I don't have a spare processor with which to test.
This remains the case on optimised or failsafe defaults, as well as on previous stable settings. Cmos reset between each test, some repeated without cmos reset with no change. It also occurs whichever stick/combination of sticks is used from the two triple channel sets. Finally this occurs whether trying to boot from hard drive, usb or cd rom. OS reinstall is inappropriate given I can't get it to boot from disk or usb stick to attempt this.
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Specification
Gigabyte UD5
Intel 920
Corsair dominator, 12gb
PC P&C 860W (tried backup psu also, both run a different system fine).
8800gt
Strangely it was absolutely fine yesterday. I left it idling overnight.
