OK, so this morning before work I turn on my iMac as I'm getting ready. When I come back to it, the computer has loaded and brought up my desktop. It has opened Mail, which I have set to open on startup. But...even though the mouse cursor will move, I can't get anything to respond. I shut it off by holding the power button down and try again. This time is comes up, and I am able to open Safari, and start browsing one of my websites. I then decided to open iChat, and then suddenly it becomes unresponsive. Can move cursor, but can't do anything. Shut down again. I turn it on again, and leave for work. When I come back, Mail is open. I am able to click on Spotlight (wanting to Repair Disk Permissions..) but end up with the same problem. I did an Apple Hardware Test and it found no problems. I turned it on after the Test and was able to get Repair Disk Permissions to start up. It is now hanging at about 75% done, which I don't know was caused by me moving/clicking the mouse or not. I have let it sit for 5-10 minutes, hoping maybe it would finish, but no luck. Oh, yes. During my startup after the Hardware Test, it opened up an app to try to find my keyboard; I switched out the batteries which had only been in there for a couple weeks with some news ones, and got it connected again. Don't know if that is significant. Anyway, I am at a loss for what could be the cause of this. It ran perfectly last night, up until 11 or so when I shut it off for the night. I didn't install anything new, not for several days. Any ideas? Would appreciate all possible haste, I'm having to use WinXP to access this site!