Black Screen after 10 minutes
This is my work iMac. I've noticed the brightness drop randomly and then go back up for the past 2 months. Friday the screen just dropped out. Went black. Playing with the brightness controls on the keyboard did nothing. My external monitor still worked fine. Turned machine off, reseated display data cable, machine booted up, worked fine the rest of the day and until this morning.
When it went black this morning, I just rebooted the machine out of curiosity. The screen came back up like nothing had happened. For 10 minutes. Rebooted again, worked for 10 then went black. Now it's in purgatory. What say you all mighty smartness?