3 Green LEDs, tone, restart, black screen
I have a 24" Mid 2007 A1225 EMC 2134 that gives me a POST tone, 3 LED lights then shuts down and restarts. It then hangs on restart at the 3rd LED. Completely black screen. No signal to external monitor. The hard drive checks out on another machine and has 10.9.1 installed. I am finally just going to pay Apple support to see if I can get a correct answer before buying any parts. Has anyone had any luck yet?
From this question a fix would seem to be reballing the GPU: No Backlight No Display 3 Diag Lights on
eBay has a guy who is doing these for about $100.
This will also answer this question: Faulty iMac - Only three LEDs appearing in diagnotics?
We really need an answer for this one instead of replacing the video card or the logic board. Both parts are still high dollar if we're just guessing.
Is this a good question?