While I can’t help you over come the stuck keyboard input. I might be able to offer a way to get to your apps and data from a second Mac connected in target Disk Mode
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* [https://computers.tutsplus.com/tutorials/understanding-the-applications-for-target-disk-mode--mac-60609|Understanding the Applications for Target Disk Mode]
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* [https://support.apple.com/guide/mac-help/transfer-files-mac-computers-target-disk-mode-mchlp1443/mac|Transfer files between two Mac computers using target disk mode]
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* [link|https://computers.tutsplus.com/tutorials/understanding-the-applications-for-target-disk-mode--mac-60609|Understanding the Applications for Target Disk Mode]
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* [link|https://support.apple.com/guide/mac-help/transfer-files-mac-computers-target-disk-mode-mchlp1443/mac|Transfer files between two Mac computers using target disk mode]
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See if you can get that far. As it sounds like you’ll need to get a new system as the cost t fix your system maybe too expensive.
While I can’t help you over come the stuck keyboard input. I might be able to offer a way to get to your apps and data from a second Mac connected in target Disk Mode
* [https://computers.tutsplus.com/tutorials/understanding-the-applications-for-target-disk-mode--mac-60609|Understanding the Applications for Target Disk Mode]
* [https://support.apple.com/guide/mac-help/transfer-files-mac-computers-target-disk-mode-mchlp1443/mac|Transfer files between two Mac computers using target disk mode]