Chosen Solution
Hi,
I’ve upgraded a late 2014 27’ 5K iMac with an Crucial MX500 1To SSD. (iMac 15,1 I5 3,5Ghz, 32Go RAM) The Imac was originally running with an 1To Seagate HDD, fusion drived with a 128Go Apple SSD blade.
The installation was flawless.
But troubles came after the Imac was set up and running.
1st Case - FusionDrive running Big Sur I create a new fusiondrive container with the freshly installed SSD, installed a Catalina copy and finally updating to Big Sur. after a couple of hours using the mac, everything starts to slow down and the mac was almost unusable, “color wheel” and the mac take 5 minutes to open a simple folder … monitor activity show “kernal_task” using more than 250% CPU Tested the two disk with driveDX => all OK results
2dn case - Catalina on Apple SSD blade After issues trying the fusiondrive, decided to split it. Installed a copy of Catalina on the Apple SSD blade and APFS formatted the Crucial MX500. at the beginning, it seems OK, but randomly the mac goes black screen and wake up by moving mouse or keyboard (like it goes on sleep) (all energy save option have been disable) NVRAM have been resteted have trying to enable TRIM
Was confused, because the OS was running on the original SSD blade and have no clue where the issue are from.
any help would be highly appreciated.
Regards.
William
Hi,
Problem solved !
I should have start by running a diagnostics test … the test return me a PPF004 code about the fan, and i’ve actually take appart the fan for a good clean and …. forgot to plug it back when reassembling the iMac… hopefully the Mac doesn’t fry ! (it was heavily used for photo and video editing !) I assume the bad performance and black screen are just the Mac protecting itself by slowing down the CPU and shutting down all process.
