I have a macbook that only displayed the question mark when starting up, so I put the install disk in, and went to repair the hard drive from the "disk utility", but it said my HD didn't need any repairs. So, I went to "startup disk" under "utilities" and was give 3 options for the system I want to start up my computer: Mac OS X, 10.4.11 on Macintosh HD Mac OS X, 10.4.8 on Mac OS X Install Disc 1 Network Startup I have tried each option. Once selected, another window opens asking if i'm sure that I want to restart using the chosen system. I click restart, and the computer goes right back to the beginning of the install disk. When I try to start the computer without the install disk in, I get the eternal flashing question mark. What do I do?