2 Replies Latest reply: Oct 27, 2011 10:53 AM by BrianM_WPG
Terrence Meehan Level 1 Level 1 (5 points)

While working recently, the screen on my aluminum 20" iMac went completely black. I could tell it was still on because my external monitor still showed the background. I tried restarting, resetting PRAM, completely unplugging for a while, but every time it starts up, the light gray screen comes on for a second or two and immediately goes black. Any one have any ideas about cause or fixes?

  • Nina Tovish Level 1 Level 1 (35 points)

    I just had a similar experience. I was working in Aperture and all of a sudden my screen went completely black. I could hear the hard drive still working, email arrival sound effects, and so on. It seemed as if the computer were still running normally behind the dark screen.


    I had to do a forced manual shutdown and reboot. On rebooting, the screen came back and all seems normal—so far.


    Time to call AppleCare?

  • BrianM_WPG Level 1 Level 1 (0 points)

    I know this is much too late, but maybe it will help someone else.


    If an SMC reset doesn't fix the issue, you could verify that it is probably the Inverter that has failed.


    (SMC reset is unplug all cables including power, wait at least 15 seconds before plugging power back in)


    To check if it is the Inverter, when the screen goes out, but it sounds like the computer is still on.  Get a bright flashlight, point it at the screen, if you can see any things that would normally be on the screen (Apple Logo while it is booting, dock, menubar, your desktop picture etc...) then it is probably the Inverter that has failed.


    (newer models use LED Backlighting, and don't use an inverter like this model does)