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iMac acting up

Yesterday, when I unpacked my older iMac (macOS High Sierra ver. 10.13.6) I had no problems, but now it is acting up. The screen is doing slow movements when loading something as if it was planned and my audio (input & output) aren’t working. I went to the system settings and clicked sound, and it is claimed that the sound is off on both input and output, but I cannot change it?



iMac 27″, macOS 10.13

Posted on Oct 9, 2023 12:19 PM

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Question marked as Top-ranking reply

Posted on Oct 9, 2023 12:53 PM

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.


NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files


NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.


9 replies
Question marked as Top-ranking reply

Oct 9, 2023 12:53 PM in response to miwnzzn

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.


NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files


NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.


Oct 9, 2023 1:56 PM in response to miwnzzn

Download and run Etrecheck. Be sure to give it Full Disk access before running.



Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support  to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.


Copy the report


and use the Additional Text button to paste the report in your reply.



Then we can evaluate the report to see if we can determine the cause of the problem.



Oct 9, 2023 1:49 PM in response to Old Toad

No, I actually have created a new account yesterday. I would like to share a video of it bugging but i cannot. When I enter my password theres some white glitches, which disappear after i logged in, or for example when i go to the launchboard and i click “other” (where you have chess etc.) it literally appears so slow as if it intends to annoy me

iMac acting up

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