Which Operating System are you running?
What revision is your motherboard?
I run a duel boot operating system windows xp pro Sp3 and windows 8 , I boot into xp 99% of the time as the hardware and software I use wont work on Windows 8. dont like Win 8 anyway.
the revision is Rev.1 at least this is what is printed on the MB
this all happened when I reinstalled the graphics drivers for my ATI 7700 card . I lost the drivers from an infection via ebay, sound graphics etc pc would boot but I only got a black screen from onboard and card graphics, got mi graphics card operating again but this SM Bus controller has a yellow ? mark and no ID so goodness knows what it is