I'm having kinda a wierd problem with Tiger. I installed it into my computer and everything is fine with the programs I'm running nothing has slowed down or anything but my computer refuses to shut down. When I tell the computer to shut down, it shuts down the programs but the computer remains on with my screen saver showing. If I leave it alone it will revert to the sign in screen as if I had logged out. It logs out fine, but it wont shut down and does the same thing when I restart it. Has anyone had this problem? Can anybody help?