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I own a repair shop I have a 21.5 inch late 2012 iMac is running so slow it times out installation of OS, and is jumpy during navigation of installation media. New Ram old ram same issue, new SSD old HDD same issue, new thermal paste same issue, any ideas are much appreciated.
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I think the original problem was a bad HDD was causing a similar issue as the lagging and jumpiness, but after I installed the SSD I never reinstalled the LCD I only tested without it, so it seemed like it was the same issue but it was a sensor not plugged in.
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Your system is in CPU Safe Mode, which the SMC logic lowered your systems CPU clocking and the fan is cranked up. Which is why your system is so slow and the jerky!
Restart the system and run the onboard diagnostics pressing the D key. Let us know what you got for errors.
Reference: Mac startup key combinations
Dan さんによる
@danj
Error: 0x8000000000000003, Cannot Load 'EFI/Drivers/TestSupport.efi
Status: 0x00000003
Randy Northrup さんによる
@danj Also it is connected to internet via ethernet so it should have connectivity. do I need to have a HDD with an OS installed connected to the Mac for this to work?
Randy Northrup さんによる
@gizmowizards - Sorry I got busy this afternoon. Diagnostics does not use your OS.
At this point you'll need to run diagnostics again, this time press the Option key as well as the D key. to get into the Apple server diagnostics. Make sure you have your system wired via Ethernet to the internet. Did you get an error at this point?
Dan さんによる
@danj Same Error
Randy Northrup さんによる
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