Hey Guys & Girls, Hoping you can help. My macbook pro 17inch won't boot up, i've had it since 2009 and its done me no wrong up until recently. I'm on youtube and then it froze, so i rebooted, youtube again (different video) froze on me again, this happened afew more times then it wouldn't even boot up. I had to use my install disk to get it to boot up, and now even that doesnt work. It just comes up with the grey spinning circle thing and the mac logo. I've tried everything, i've researched it alot but just putting post on here to see if someone has an idea that i'm unaware of in my days of trolling forum sites. Any help to avoid taking it into the mac shop would be great!!! Peace!