Ok well I think my computer crashed because one day it froze up and I force shut down and now when ever I start it up it says "You need to restart your computer. Hold down the Power button for several seconds or press the Restart button." So i wanna restore it to my time machine back up but I don't know how to go about doing that. I tried inserting the Mac OS X Install DVD but it won't go in. So I really need help, Thanks.