I was recently using the program Onyx to verify and repair permissions when my iBook G4 crashed. I tried rebooting, but instead a black screen with the the following messages came up: Jun 3 13:40:37 init: can't exec /bin/sh for single user: Exec format error Jun 3 13:41:07 init: can't exec /bin/sh for /etc/rc: Exec format error I have no idea what happened to my iBook! I tried restarting from the tech tools cd that came with the AppleCare, the Software Install, and the OSX cd. None of them worked. When I put in the Software Install cd, it told me to type in "mac-boot" or "shut-down." The other two cd's didn't boot up at all. I also tried Safe-Boot. Nothing is working right now. I've been trying to troubleshoot this problem all night and I've had no luck. Do I need to take it to a shop? Will the AppleCare Warranty cover software related problems? I don't think it's my hard drive. Well, I hope I can get some feedback on this problem. Thanks.