I have newly purchased an Intel DP55KG motherboard. The hardware was running fine now for one week with UEFI disable and the previous MBR HDD setup beneath the Windows 7 (64) operating system. I experienced an UEFI based installation on an empty HDD with a GPT disk present. Installing Windows 7 (64) wasn't a topic at all I could get the computer system up and currently executing etc. After a few minutes on the desktop my GFX card suddenly switches to black screen that I can only get rid off by rebooting my computer. I am not getting what is happening to my computer system please help me out from this trouble. Any help regarding the same topic may be respected. Thanks in Advance.