This LED will be ON when the computer is turned on and the power supply is working correctly. LED 2 - Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. The LED will turn off only if the AC power is disconnected or the power supply is faulty. The LED will remain on even when the computer has been shut down or put to sleep. This LED will remain ON while the iMac is connected to the AC power.

LED 1 - Indicates that the trickle voltage from the power supply is detected by the main logic board.

It'll be fine for light use, I guess I can just game on the house PC.īut as-is, if it's the LCD, I just can't justify dropping $600 to repair a Haswell era box. Has anyone dealt with this sort of problem before? Any chance it's the display cable or something instead of the LCD panel? I'm planning to replace it with a newer Mac Mini, though the low GPU performance worries me (I expect I won't be playing Kerbal Space Program on a Mac Mini's GPU). I can do the replacement, but that's just painfully expensive for a 6 year old computer. The problem is that a replacement LCD panel for this series of iMac, in 'not cracked' condition, is $600. GPU seems fine, external display connections seem fine, etc. Working with an external monitor is fine (once I got it to boot into the OS instead of recovery mode - the screen came back just long enough for me to figure out what was going on). No physical damage, the machine wasn't moved, just up and quit.

I have a late 2013 iMac, 27', Haswell, 780M.

Imac 27 late 2013 screen