I am getting the exact same problem. I just finished installing Ubuntu and ever since I just put in the partition (before I even installed ubuntu) Windows wouldn't start and gave me the blank screen. I also tried getting to the Recovery Console, with no such luck either. F11 and F8 don't respond. Period. I have an HP Pavillion a1730n that I purchased just last week. Geforce 8600gt card installed, but Windows won't work with that or my onboard graphics. If anyone has a solution for this problem, please send me an e-mail at Kevhouse0308@gmail.com
Thanks!