ok so i have a brand new HP dc7900. im trying to install windows 7 onto the computer cause the current hard drive has no OS on it. so i load the windows 7 cd into it and it goes into installing mode no problem. once it installs and boots up into the windows 7. goes to the "starting windows 7" screen and the windows logo loaded then the video input just goes BLANK and nothing happens ! ugh i dont know what to do i tired installnig widows 7 on it like 20 times already and the same issue.