Oh crap,

I'm having problems again with my UD4.
Got me a 2500k and wanted to try it out.
Restarted my rig, loaded optimized defaults, restarted and shut down the rig afterwards.

Uninstalled my 2600k and installed the 2500k.
Rebooted, nothing. Continuous reboots.
Cleared CMOS, unplugged power cables and retried, nothing.
No post.

Tried it several times but no luck, system didn't boot.
Unplugged everything, reinstalled my 2600k and retried.
Again no post, only endless reboots.

Tried another PSU (Corsair 620w), nothing.
Retried the 2500k, same result, no post.
I've tried everything I could but the system simply won't boot anymore.

I think i'm gonna give up on this board and gonna try something else.
After 2 weeks of trying, I'm sick and tired of this POS board (this is my second UD4 which won't work properly), Never had any problems with my P45-UD3P, which has worked flawlessly for 2 years.

I'm unplugging all cables overnight and will give it one last try tomorrow.
If that doesn't work, I'll probably buy another board but no Gigabyte.
Or I'll go back to my S775 rig.