iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

401 Questions View all

Black display on iMac but external display works

My iMac's display functions normal through boot up but then goes black anywhere from 10 seconds up to a minute or so after fully loaded. It works perfectly fine on a external display. Often when I leave my computer to sleep and come back to it, it will once again come back on for a short amount of time.

This started gradually probably 6 months ago. It would go black after using it for an hour or so and over time would go black quicker and quicker.

I brought it to Apple and they determined it was a backlit issue, which they replaced. It worked for maybe a week before it started happening again.

Any help would be very, very appreciated! Thank you for your time in advance.

Answered! View the answer I have this problem too

Is this a good question?

Score 1


Can you discern the desktop using a flashlight held at an angle to the screen?


I can, but just barely.


Add a comment

1 Answer

Chosen Solution

As long as can see the screen, the GPU is good and so it the LCD. Replace the driver board: iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement

Was this answer helpful?

Score 3


Thanks for your quick response.

I brought it to Apple a few months back and they replaced the backlight board already.


Contact them and ask for a warranty exception. Frankly, since Apple considers this a "Legacy Machine", since it is over 6 years old, I'm very surprised they worked on it at all.


It's a shame because beyond the display it really works fantastic.

Thanks very much I really appreciate your help.


Add a comment

Add your answer

JJ will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 0

Past 30 Days: 1

All Time: 212