A few weird issues with my iMac 20inch that's 3 years old, running Snow Leopard. These issues don't happen every single time I'm using my computer, but it happens enough to warrant a post here, I think! They also usually occur during the same periods of time which I call "weird mode". 1) When I try to enter the login password (to get out of the screensaver mode) then the password field doesn't let me type in anything. All I hear is that clicking noise. If I hit "switch user" button, then I get the main page and I can enter my password ok in that area. 2) I can't open applications. 3) If I want to force quit, I'll go to the Force Quit menu from the Apple icon in the corner but no applications show up in the list, not even Finder. 4) If I happen to be using iTunes when this weird-mode happens, the iTunes window won't come to front of the screen (it stays behind the windows of other programs). 5) computer won't restart the regular way (apple icon in the corner...) The only way to make it good is to restart manually. Any ideas would be hugely appreciated!