Just finished a new build using the Intel DP55KG board w/Nvidia 9800GTX video. So far everything works except menu shutdown & reboot. 9.1 is a great product but it's unfortunate a bug like this may mar a new install for some. A work-around for the shutdown problem is to simply press the ALT & SysReq (Print Scrn) keys and slowly type REISUO. For a reboot do the same only type REISUB.
Hope this helps someone
Hope this helps someone