iMac 2020 cannot wake up. Kernel panic occurs.

My iMac cannot wake up after an extended period of sleep. Anyone knows what causes the problem? After reboot, it reports the following error message:



iMac 27″, macOS 14.1

Posted on Nov 12, 2023 3:39 PM

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Posted on Nov 13, 2023 6:15 PM

Contact the seller ask them questions I asked you about the RAM. RAM is a common hardware cause of KPs.


When you got the computer was it set up per the directions in What to do before you sell, give away, or trade in your Mac. If you don't know then that is another question to ask the seller!!!!!j


If you cannot reach the seller then my recommendation is to take the computer to your local Apple Authorized Service Provider to have it professionally diagnosed. Apple Authorized Service Provider Locator (AASP) & Genius Appointment. Trying to diagnose a KP issue on a forum is difficult in the best of circumstances. With a used computer, it's darn near impossible. DO NOT take it to your local general computer store, only use an Apple Authorized Service Provider!!!!

10 replies
Question marked as Best reply

Nov 13, 2023 6:15 PM in response to ErnestPan

Contact the seller ask them questions I asked you about the RAM. RAM is a common hardware cause of KPs.


When you got the computer was it set up per the directions in What to do before you sell, give away, or trade in your Mac. If you don't know then that is another question to ask the seller!!!!!j


If you cannot reach the seller then my recommendation is to take the computer to your local Apple Authorized Service Provider to have it professionally diagnosed. Apple Authorized Service Provider Locator (AASP) & Genius Appointment. Trying to diagnose a KP issue on a forum is difficult in the best of circumstances. With a used computer, it's darn near impossible. DO NOT take it to your local general computer store, only use an Apple Authorized Service Provider!!!!

Nov 13, 2023 5:32 PM in response to rkaufmann87

I obtained the entire setup from someone else. Not sure about the source of RAM. Below is the RAM information:


ECC: Disabled


  Upgradeable Memory: Yes




Slot 1 (Channel A / DIMM 1):




  Size: 32 GB


  Type: DDR4


  Speed: 2667 MHz


  Status: OK


  Manufacturer: Samsung


  Part Number: M471A4G43MB1-CTD


  Serial Number: E12873A3




Slot 2 (Channel A / DIMM 0):




  Size: 32 GB


  Type: DDR4


  Speed: 2667 MHz


  Status: OK


  Manufacturer: Samsung


  Part Number: M471A4G43MB1-CTD


  Serial Number: E12873A3




Slot 3 (Channel B / DIMM 1):




  Size: 32 GB


  Type: DDR4


  Speed: 2667 MHz


  Status: OK


  Manufacturer: Samsung


  Part Number: M471A4G43MB1-CTD


  Serial Number: 015CE36F




Slot 4 (Channel B / DIMM 0):




  Size: 32 GB


  Type: DDR4


  Speed: 2667 MHz


  Status: OK


  Manufacturer: Samsung


  Part Number: M471A4G43MB1-CTD


  Serial Number: 015CE86E

Nov 13, 2023 9:17 PM in response to ErnestPan

That's really good that you have the original RAM. Remove all the RAM that is currently installed and then re-install the original RAM and restart the computer normally and test it for a few days. If the KP's disappear then you know the KPs were caused by the RAM that was installed. Most experienced users on these forums only recommend Crucial.com or Macsales.com RAM, anything else is iffy at best. iMacs are very very sensitive to RAM issues and don't do well with inferior quality RAM.


Mac OS is not like MS Windows that needs a re-install periodically. Mac OS in vast majority of cases simply doesn't need it, usually issues are due to something a user has installed or some type of user error.

iMac 2020 cannot wake up. Kernel panic occurs.

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