yes the boot loop here is not the same it isn't an infinite boot loop. if you allow it to cycle it will eventually act like nothing happened, your POST code should read 8_ then the board should turn off turn back on and then act like its going into the BIOS, then it will do db on the POST code, and then it will restart and either do the 8_ and db or it will boot with your OC without issues. It happens every certain amount of boots and it is different per board, however it only happens with Sandy Bridge. The loop happens every 6 to 8 on/off cycles, and exact at the number, so after 7 cycles if it happened to you then after 7 more it will happen again. I think it has something to do with clearing the checksum. However it doesn't hurt anything, it doesn't erase your settings, and you really don't have to do anything it just is annoying b/c it takes an extra 10-30seconds every 6 to 8th boot. If it makes you feel better with ivy(retail stepping) i restarted the UD3H 100 times, the UD5h 100 times, and M3 100 times with an OC and there was nothing like this lol.
So here is the deal, it is a known issue that can be reproduced, that wasn't the case with the Z68 boot loop, it was random board to board configuration to configuration, but this one is totally with Sandy bridge only and not ivy Bridge. This means that it is much simpler to fix, it could just be an error in the coding or a part of the microcode that needs sandy bridge steppings added. The thing is beta testers, me included, didn't test sandy bridge, as we were trying to figure out all the Ivy Bridge issues first as the boards weren't supposed to release way before.
So here is what i recommend you doing:
Flash your BIOS, and reboot and "load optimized defaults" and reboot, this is something you should always do before you OC and after your flash your BIOS.
If you have a UD5H, UD3H, or Sniper 3 flash your backup BIOS to the same as your main, this was one thing that helped with Z68 boot loops, but it doesn't make a difference now, however it is easier for the ME to do things and your POST should be faster if they are the same as well. if you have a M3, or other boards without the switch, pressing ATL+F10 will flash your backup BIOS.
Here is the good news:
If you wont ever put a sandy bridge processor in your motherboard, then you are fine, you wont have this issue.
If you are upgrading to ivy bridge you only have 1 week left
If you are stick with sandy bridge, the issue is easy to replicate, and since i reported it there have been no more BIOS updates, so hopefully the next one, which is due very soon will have a fix for it, if not then perhaps the next final BIOS which shoudl also be soon, as the rate at which the BIOSes are being updates is extremely fast.
Edited by Sin0822 - 4/17/12 at 5:08pm