Three times in the past two weeks my screen has suddenly turned black on my MBP and I have had to pull the battery and do a reset to get it to work again, sometimes a couple of times. When it initially goes black I can still see the screen (no backlight) and get it shut down, but multiple reboots do nothing to help. Additionally, the computer doesn't seem to be starting up properly until the screen finally comes back. The computer is no longer under warranty, so I would prefer to try fixing this myself. Any suggestions?