I've just built a new desktop, mostly using new parts but a couple from my old PC, including the hard drive.
Booting up went fine, but I have decided to reinstall the OS to start afresh. I went into the BIOS and changed the boot order to DVD drive first, and popped Win 7 64 bit into the drive. Despite the fact that the motherboard detected the drive, it won't load the OS. All I am getting is a black screen with a blinking _ cursor.
Are you using the original W7 DVD, or a copy? I've seen the symptoms you have mentioned before, but only on copied DVDs. In which case, either using the original DVD, or reburning it onto a different media may help you.