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Model A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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iMac not booting and showing blank screen

I have an iMac from 2012, and has been working so amazing until earlier today. My iMac has been crashing constantly, and I went to turn it on, and I have a blank display. My screen is not glued to the chassis, so I wa able to prop it open to look at the LEDs. I saw all four. Please help, I have no idea what Is going on. Also, I reset RP ram or whatever, played boot noise, but then showed wight screen.

Thanks,

Update (03/25/23)

Ok, it has been off for a while, and now it works.

After a while of the blank screen, I see the folder with the question mark. I will try to look into this further.

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I found out what it was. I disconnected and reconnected the SATA and SATA power cables, and it booted without a problem. Don’t know what and why it exactly happened, but I’m glad it works now!

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Sounds like your drive gave out. What is your systems config if you remember. HDD, SSD or Fusion.

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I am using an SSD instead of an HDD, I replaced it about a month ago.

My drive must be glitchy or something like that. When I try to boot sometimes it does.

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@ottobunnycoder - What was the drive make and model as well as size.

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It is a PNY 500 GB SSD. I disconnected and reconnected the SATA and SATA power canes, and now it works just fine.

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If your iMac starts up to a blank screen, it could result from display issues (eg. The iMac's display may be faulty or disconnected), incorrect startup settings, corrupted software, malfunctioning hardware, and more. To fix this issue, check out the post offered by the Apple Official:

https://support.apple.com/en-us/HT210905

If your iMac displays a folder with a question mark at startup, it means that the computer cannot find a valid startup disk or operating system to boot from. Given this condition, check out the following post offered by the Apple Official:

https://support.apple.com/en-us/HT204323

It's worth mentioning that no matter what causes your iMac to fail to boot, your data will be at risk. You'd better recover the important data before fixing these problems by restoring your Mac from Time Machine backup if you have enabled Time Machine, restoring your Mac from APFS snapshots, using Target Disk Mode, or using data recovery software like iBoysoft Data Recovery for Mac (file retrieval from an unbootable Mac under macOS Recovery Mode without installing it on your iMac or creating a bootable drive), Stellar Data Recovery (unbootable Mac data recovery without using any external bootable devices), Tenorshare 4DDiG for Mac (unbootable Mac file recovery via creating a bootable drive), and more.

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@cristinawong - Did you note this clue?

“I see the folder with the question mark. I will try to look into this further.”

This is a sign of a failing drive, not a screen issue. We need to focus on the drive.

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@danj Yeah, you are right. In this case, it has nothing to do with the screen.

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