I have a DQ67OW and I5 2500 using the onboard video. The system will not boot reliably (win7 64). Goes to Starting Windows, the black screen, then no signal to monitor. Will boot reliably in Safe Mode, not reliable in Low Resolution mode. After several reboots, system will work fine. Shut down and later re-start, same problems. I have disabled the video adapter in windows and all works well, boots every time, but resolution max is 1600X1200, and my monitor is 1920X1200. The specs say that this is within the range of capability of the video. Do I have a bad MoBo, or is the driver bad? Using the latest (May 3) driver, but windows reports the date as April 10 (the date of the earlier driver)
Try updating to latest bios, version 0052. It's update with latest video bios.