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I've got a 27 inch iMac made in 2011 that displays 5 pink vertical bars on the screen. It won't boot properly. I ran the Apple Hardware Test and it came up clean.

Machine Specs:

Apple Subfamily: Mid-2011 Apple Model No: A1312 (EMC 2429)
Model ID: iMac12,2

5 pink bars on 2011 iMac

  • Does it do the same if you boot to the Recovery HD? Pressing command ⌘+R at boot, have a look at OS X: About OS X Recovery, or booting from a USB Installer of OS X? – user3439894 Jul 21 '15 at 20:29
  • I've been able to boot in verbose mode. It tries to do an fsck_hfs a number of times and then aborts with "boot task failed". It seems to keep coming up with "Incorrect number of thread records (4,23467)" each time. Currently, I do not have pink lines on the screen, and I'm booting off a Yosemite USB stick I made. I'll see if I can run disk utility from that to fix the hard disk errors and rescue the data. – KIsmay Jul 21 '15 at 21:13
  • Sounds like a plan. After backing up your Data you might wan't to consider reinstalling OS X to see if it takes care of the pink lines. Hope it's just a corrupted driver issue and not failing hardware. If a clean install doesn't fixit then you'll need to take it to Apple or an authorized service center. – user3439894 Jul 21 '15 at 21:28
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    I had to wipe the drive and reinstall OS X. It didn't display the issue when I booted from my USB drive, so it was software. If you get the same problem when booting from another drive, it could be hardware. – KIsmay Feb 11 '16 at 16:52
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    Possible duplicate of Mac turns off randomly and has lines on screen – Allan Feb 17 '17 at 14:37
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I have had this problem. It coincided with the iMac running very hot. It crashed and the pink stripes appeared. Every time I tried to start it, it stopped loading and rebooted. I thought it might be the video chip (I'm no Mac expert). I gave up and left it for months then tried again, rebooting holding down the shift key and various other combinations of keys that I'd read about. This went on for hours but somehow the pink bars disappeared eventually, returned then went again. Eventually and to me, miraculously, the Mac started! I read somewhere that out of date software can make the Mac run too hot so I checked via the disk utility and found disused printer and scanner drivers using a lot of power so uninstalled them. Eventually after another crash or two and the stripes reappearing, I found that turning on holding down the shift key until the screen cleared, shutting down and starting again the OS loaded. It started running cooler and after shutting down correctly and restarting a few times all seems well (so far!). It has been like monkeys typing Shakespeare but I'm glad I didn't take the advice of a computer repairer I'd phoned who told me I should scrap the iMac (a near top of range 2011 model costing me £1600), take out the hard drive and put it in another Mac! I hope this garbled account might give a little hope!

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The correct would be to seek assistance in your country and city, this defect is the video card.Apple had released to a Recall to return for no cost video card.

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This is most likely a bad graphics card, which is built in to the logic board on most iMac models. It also could be a bad display, though that's much likely. And it could also be a bad display cable, though that is the least likely solution.

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