I have read that there is a design defect on this chipset and it runs way too hot. it has a north and south bridge including 2 heat sinks. mine burned out and am stil fighting for over 6 months to get it fixed under waranty. my advice is 2: (a) put in better cooling fans etc. (b) put in your own video card with fan blowing out the back of case. (c) put in a slot blower. There are also some chipset heat sin fans. available. there are 2 types: push pin bolt through, and wire clip mount. the intel video is on the tiny heat sink. (way to small) can not cool. Thermaltake Spirit A100 might fit.
I have 4 of these boards and only one has a persistent problem. It happened to have a VGA-DVI adapter connected to a CRT monitor originally. I can't conclusively say this is the cause since other hardware and software could be involved. Few are willing to fully describe their configurations. In my case I repaired an LCD monitor which now works elsewhere but on the one system will not sleep by itself with a DVI connection (OK computer sleep or hibernation). I've removed the speakers that could have created a short. I don't have any HDMI to test with but it works correctly only with the VGA-DVI adapter.