I recently got a HP Pavillion zd8000 which had Windows XP installed on it.
I installed windows 7 on it and had the graphics card problems where the screen wouldnt display anything.
I followed the directions for MObility Modder and the laptop worked fine.
Then a couple days ago, it would start up, show the login screen for about 5 seconds, then black out. i would hear the windows login noise but nothing would happen.
i experimented with it and found if i disconnected all power from the computer for about 10 seconds, then recconected it and started it up it would work
this is very annoying because i cant put the computer in sleep and would like to have it fixed