I have a 4 year old MacBook Pro. When I turn it on, I get these crazy vertical bars and an error message that says "You need to restart your computer. Hold down the power button for several seconds." Here is a pic: http://postimage.org/image/km2h59plz/ Every time I restart the computer, it gives me the same error. I tried holding down Command, Option, P, and R, but no luck. Is there anything I can do?