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Model A1224 / Mitte 2007 und Anfang 2008 / 2, 2.4, oder 2.66 GHz Core 2 Duo Prozessor

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"This software cannot be installed on this computer" OS install error

I picked up a mid-2007 iMac with El Captain installed and working (more or less.) It did not have a password set for the user, and there was no Apple ID signed in. It was having some issues, so I decided to re-install the OS. I booted into Recovery Mode and erased the drive, and then proceeded to try re-installing the OS through the utility. After signing in with my Apple ID, it displayed an error message reading “This item is temporarily unavailable. Please try again later.”

The iMac also came with its original OS X install discs (version 10.4.8,) so I figured that I could boot from the install disc and re-install the original OS. Upon booting from the disc, the installation utility displays a "This software cannot be installed on this computer" error. I’ve tried resetting the date to 1-day after 10.4.8’s release date (9/30/2006) to bypass the version signing roadblock, but to now avail. Even after doing that, the same error is displayed.

I tried following this solution, however, when I try to create a new partition, I get a “Partition failed with this error: Input/output error.” Interestingly enough, the installed drive is a 1TB drive but the DU is reading it as a 7.3TB Drive. The DU also says that the drive is verified. Under the “First Aid” tab for the drive, there are no drives visible in the list.

From what I've read, the input/output error usually indicates that the drive has failed. I don’t know how the drive suddenly failed, as it was working fine earlier today and booted into Recovery Mode multiple times with no issues. Perhaps erasing the drive in Recovery Mode somehow damaged it? Which would defeat the purpose of Recovery Mode.

Now, when I start the computer and try to boot into Recovery Mode with Command+R, nothing happens and the folder icon with a question mark just flashes on the screen.

Any ideas? Any help would be greatly appreciated!

EDIT: Updated device from 21.5” model to 20” model.

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Lets verify which system you have as there was no 21.5" iMac built in 2007. You either have a 20" or a 24"

Locate the systems S/N on the bottom of the foot and plug it into here EveryMac - Lookup let us know what you have.

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@danj Whoops, you're right. It is a 20" model. Sorry about that. The model number is A1224.

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OK, now that we have a firm idea on what you have for a system we can work through the different issues you are facing here.

The first is what drives are workable: You are limited to older SATA II (3.0 Gb/s) so we need to make sure the current drive is the correct one.

The next which you appeared to have tried to over come is Apple uses a certificate system, the OS installer needs to validate its self to the systems date held in its clock. If it is not within its window it will fail, heres a deeper explanation: If you've got an old macOS install image, it will probably stop working today.

So you either need to alter the systems date or use an updated installer!

Here’s an updated installer How to upgrade to OS X El Capitan, Jump down to Step 4, make sure you click on the blue URL link “Download OS X El Capitan” to get a fresh OS installer.

You’ll need to create a bootable OS installer drive either a FireWire or CD/DVD as this series won’t boot from USB How to make a bootable OS X 10.11 El Capitan installer drive

Your other option is to use a second system in Target Disk Mode following this guide: Understanding the Applications for Target Disk Mode

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Luke R. wird auf ewig dankbar sein.
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