Yesterday i was playing with my mb and disabled SMART on my raptor.
After doing that system start hanging at random moments with hd activity to maximum. I enabled SMART again and probs didn't disappear. Even unplugging psu and loading setup defaults in bios didn't help.
Only when i cleared cmos, board got back to normal. This was the first time i had to clear cmos on Maximus. :p:
Just wanted to share it with u, if anyone ever faces the same prob...