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

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Screen black after HDD replacement

I have a late 2009 iMac 27" and the harddrive died recently, so I took it upon myself to replace it. I followed the iFixit guide and everything went well! Managed to find and format the drive and restore everything from my time machine backup.

After maybe an hour into the restore I noticed that one half of the back-light was faded. At this point I didn't think the issue was too big so I let the screen turn itself off during the restore and figured that I'd have a look at the issue after it was completed.

Anyway I go to work and come back and the computer is off. Apparently there had been a power outage in my neighbourhood and we were without power for an hour -- I rebooted it and it sounded normal but the screen would not turn on at all. I used my rMBP and screen shared to the imac and, yep, it was working perfectly, but the screen stayed blank.

Any ideas of what might have happened, or if there's anything I can have a look at? Perhaps a ribbon cable is loose? Open to trying anything, happy to write the thing off, I don't really use it for anything other than a screen for watching things in bed, second monitor for macbook and plex media server.

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You may have a short, check the backlight cable for damage. Review this IFIXIT guide: iMac Intel 27" EMC 2309 and 2374 Display Replacement Step 6.

You may need to replace the LED driver board. Follow this IFIXIT guide: iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement as well if you found the cable was damaged.

iMac Intel 27" EMC 2309 and 2374 Display Image


iMac Intel 27" EMC 2309 and 2374 Display Replacement

Difficulty: Moderate30 minutes - 1 hour

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Hold a flashlight at an angle to the screen and see if you can discern the desktop,


Opened it up and found my LED backlight cable had come unseated. Fixed it and now it works like it used to, no dramas!


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abkleinig will be eternally grateful.
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