Why does my iMac ask for me to restart?
When I power up the Apple logo and white screen will appear and then all of a sudden it will ask for me to restart. When I do restart it it will continuely ask me the same thing. Diagnose Led #1, #2 and #3 are all lit up when I powered it back up with the back of the unit removed. But Led #4 is not lit up at all. What could be the cause? Any help is definitely aprreciated.