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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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Why are there vertical blue lines and I cannot login

I have vertical blue lines on my monitor. When I restart I get the same thing and any text or graphics look blurry. This prevents me from logging on. I have tried rebooting using other modes explained online with no success. Any ideas on the issue?

Block Image

Update (04/05/2021)

Is there a simple fix for a replacement part or is it time to just retire this computer? If it’s time for replacement, I’m totally fine (have backups from time machine) but before I get rid of it how do I best clean the computer of personal info before it gets recycled, since I cannot access any info right now?

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Not good ;-{

Your GPU board has failed iMac Intel 27" EMC 2429 Radeon HD 6770M Graphics Card

crwdns2886500:0Replace a Radeon HD 6770M graphics card in a Model A1312 Mid 2011 27" iMac.crwdne2886500:0

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iMac Intel 27" EMC 2429 Radeon HD 6770M Graphics Card

$99.99

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Is there a simple fix for a replacement part or is it time to just retire this computer? If it’s time for replacement, I’m totally fine (have backups from time machine) but before I get rid of it how do I best clean the computer of personal info before it gets recycled, since I cannot access any info right now?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

@Chris Radcliffe - Some people have managed to cook the board to get a bit more live out of your system. Replacing it is getting hard as these board are no longer being made.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Thanks for the advice. I have seen some discussions on that but I think I’ll retire it. Is there a way to clean computer of personal info before I recycle?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

@Chris Radcliffe - You should still be able to boot up in Target Disk Mode. See if you can you should see a FireWire or Thunderbolt Icon on your screen if you do then you should be able to connect your system to a second Mac to copy off your system and properly wipe down the drive so nothing is recoverable.

Reference: Understanding the Applications for Target Disk Mode

If that won't work then you can remove the drive and use a 3.5" SATA to USB case to hold your drive to then copy stuff off or even use your drive as a backup.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Great! Thanks again!

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