One of many 12 iMacs right here has an enormous drawback: it takes two hours from urgent the button to show it on till lastly ditching the progress bar and displaying up the desktop.

It’s a MacOS 10.15 Catalina operating on an Intel processor.

Methods to make it usable once more? Or, at the least, what ought to I strive?

What have been tried to date?

  1. Adopted the Apple tutorial, that instructs to “use Disk Utility”. All the opposite directions supposes that the Mac is popping sluggish after booting up, however this isn’t the case, so they do not apply right here. The “Disk Utility” discovered no issues;
  2. Adopted the How To Geek tutorial, part “{Hardware} Points: Issues Underneath the Hood”, since something above this part supposes that the Mac is popping sluggish after booting up, however this isn’t the case, so they do not apply. As recommended there, I entered “Apple Diagnostics” by holding d whereas booting up, to enter the “diagnostic software”. This resulted within the following error, in addition to utilizing ⌥+d. And this error is not a legitimate error code output from the software, it is simply the software not having the ability to load in any respect:
Error: 0x8000000000000003, Can not Load 'EFI/Drivers/TestSupport.efi'
Standing: 0x00000003
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