After an unsuccessful attempt at resetting PRAM every time I turn the brightness completely down after about 15 - 20 minutes it'll move up once space. It's the most annoying thing ever! I've tried several more times to reset PRAM but I never get to the second chime, which actually brings me to another problem I've been having. I think that I can't get to the second chime because my computer won't restart properly. This has been happening for a little while now. I'll try and restart my computer but it doesn't even shut down completely and I'll have to force it. Hopefully someone can help. Thanks in advance!