I woke my Macbook from sleep and immediatly I get a Kernal Panic. I Quickly Restart and the computer does not startup. It stops at the grey/white screen that first appears, (no apple logo), then three clicks are heard; waiting a min or so the clicks repeat again. The tone sounds intentional as if it is telling me there is a problem. The computer is unresponsive. I have not installed any software resently and am running Mac OS 10.5.2. I have recently verified the disk which was ok and recently repaired permissions so I'm not sure this could be a HD (disk) issue. Could this be a hardware problem? What should I do?