Having problems with my hard drive (running Panther) - hard drive less than a year old. After sitting idle for awhile, my screensaver came on, then it went into rest mode. When I moved the mouse to "wake it up" it wouldn't come out of sleep. Finally, I restarted. After waiting, the folder and flashing question mark came up. I can see both my Master and Slave WDC harddrives in Disk Utility. I click Verify my Master drive, it states "checking HFS Plus volume", but then I get the message: "Invalid B-tree node size; the volume needs to be repaired" - but it does not let me repair it. I've tried this a few times, and "Verify Completed" continues (once for up to 5 hours). Help please.