My first gen Macbook's (2Ghz C2D, running 10.4.11) HD started clicking after the iTunes 7.6 and Quicktime 7.4 downloads last night after I chose to shut down the computer rather than restart. The computer hung by just displaying the desktop without the menu bar or the dock showing. It was getting late so I just manually shut the system down. Upon starting it up this morning the same issue persisted, so I tried the normal boot from DVD method and the single-user mode method (to run fsck) and neither option will work (after holding down the appropriate button combinations for longer than 5 minutes). I tried to reset the PRAM and it seemed to work (i.e. I heard the chime while holding the keyboard command and it restarted), but it went to a solid question mark folder. Several attempts later both the DVD boot method and the single-user mode boot lead me to the same solid question mark folder. It seems like my HD is gone for good (and no, I do not have a back up of that HD), but I was under the impression that DVD booting and fsck should work regardless of the HD status. Is there anything else I can try? P.S. The original HD was replaced when I bought the unit with a Hitachi Travelstar 7200rpm 100GB HD, so supposedly it should still be covered by Hitachi's 3 year warranty.