I have similar problem, when I start computer after shut down, computer start boots, but it is not success. It tries many times to boot, but it was not able to find graphic card (monitor is still sleeping). I have to switch off and on power supply and after this is everything OK, the same all OK is after restart. First I thinking that mistake is in version of BIOS (I had bad version 2053), now I have right BIOS 2040, next I tied to change graphic card from GeForce9600GT to current GIGABYTE GTX 560 SuperOverclock edition. I think the MB DP67BG has problem with Nvidia cards. I tried to solve it through Chat with Technical Support Engineer, although he have not find any HW incompatibility, it had no result. I wait for next version of BIOS and if it will not solve it I will change MB.