I was on the facebook, macrumors, and engadget, when all of a sudden i got the beach ball and everything froze. I shut the computer down by holding the power button because there was no other way to shut down the computer. I waited 10 minutes for the beach ball to stop but it did not. I went to turn my computer on and nothing happened. I only got the gray start-up screen. I was like, "Damn, this can't be good." So I put in the OS X disc and went to disk utility and this is what I got: Verify and Repair disk "Macintosh HD" Checking HFS Plus volume. Invalid B-tree node size Volume check failed. Error: The underlying task reported failure on exit Does this mean my 4 1/2 month old HD is dead? Do I need to take it to an apple store for a new HD? Please help. This is my first mac. Thanks in advance.