this morning i took my ibook to a reletives in a secure bag and opened it up there turned it on, and heard this ticking noise from the optical drive then the cd i had in there ejected, i then put it back in, for about 2 minutes it kept ticking and sounded like it was reading the cd, but then it ejected it again it has been doing this all day somebody help , ibook g4 14" 1ghz, i don't want to open it up for nothing is it broke 