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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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iMac won't boot, 5 red lines appear on grey screen

Does this just mean I need a new graphics card?

Most recently I've tried internet recovery and it's been stuck on 24:00 minutes remaining with no progress for an hour now. I've also tried the following:

SMC reset. Shut down and unplug all cables including power cord for at least 30 seconds and then plug in power cord and keyboard/mouse.

PRAM reset. Hold down option, command, P and R while booting. Start it when you hear the sound and don't let go before it reboots.

Safe boot. Hold down shift while booting to boot into safe mode. If this works, open Disk Utility from Utilities and repair your permissions and verify the disk

Boot from another Mac (Thundebolt target disk mode). Connect the machines with a Thunderbolt cable. Power on your Mac and press T. Select the other Mac's hard drive. Download the current OS X combo update. Run the combo update installer and select the drive that won't boot as the destination.

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I'm confused here... Safe boot works, yet running in target mode doesn't (just the system alone). As for connecting via Thunderbolt cable some early systems had issues connecting in target mode so I wouldn't put to much on it working. Try FireWire if you can or via Ethernet. Can you access the HD that way?

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Apologies, running in Target Mode does work.

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Is the display clear of any artifacts? When you run it in Safe boot or Target mode?

Try running disk utility if you can get the system to come up in target mode from the other system.

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The 5 red lines still appear at all times. Managed to run disk utility and verified everything on the disk but lines are still appearing.

Any ideas?

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Ok in safe mode can you connect an external display and is it clear of the red lines? If so they the internal display is damaged. If not the GPU is the root issue here. You will need to swap out the graphics card.

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Thanks Dan, I'll give it a go.

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Scott will be eternally grateful.
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