Hi I had the similar issue! This page did point towards a solution. After replacing broken screen of my Imac 27” late 2015, it was really slow where the system usage at idle was over 60% and the fan was at full speed 3600rpm.
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On the apple troubleshoot scan result I got a error code PFM006. Which is an error related to CMS. I tried resetting the CMS, but no luck. Later after reading more a though I have damaged the HHD, so I opened to swap the HDD from another MacPro Desktop to see if CPU usage drops, but no luck. Got to reseaching more and I landed here where. I checked for sensors and i noticed i did not swap the screen sensor from the old screen! I placed the sensor into the new screen, booted and it was working normal speed, cpu usaged drop below 3% and the fan was working at normal rpm.
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On the apple troubleshoot scan result I got a error code PFM006. Which is an error related to CMS. I tried resetting the CMS, but no luck. Later after reading more a though I have damaged the HHD, so I opened to swap the HDD from another MacPro Desktop to see if CPU usage drops, but no luck. Got to reseaching more and I landed here so I checked for sensors and I noticed I did not swap the screen sensor from the old screen! I placed the sensor into the new screen, booted and it was working normal speed, cpu usaged drop below 3% and the fan was working at normal rpm.
So if you get similar error please check all temp sensors! :)
Hi I had the similar issue! This page did point towards a solution. After replacing broken screen of my Imac 27” late 2015, it was really slow where the system usage at idle was over 60% and the fan was at full speed 3600rpm.
-
On the apple troubleshoot scan result I got a error code PFM006. Which is an error related to CMS. I tried resetting the CMS, but no luck. I later after reading more a though I have damaged the HHD, so I opened to swap the HDD from another MacPro Desktop to see if CPU usage drops, but no luck. Got to reseaching more and I landed here where. I checked for sensors and i noticed i did not swap the screen sensor from the old screen! I placed the sensor into the new screen, booted and it was working normal speed, cpu usaged drop below 3% and the fan was working at normal rpm.
+
On the apple troubleshoot scan result I got a error code PFM006. Which is an error related to CMS. I tried resetting the CMS, but no luck. Later after reading more a though I have damaged the HHD, so I opened to swap the HDD from another MacPro Desktop to see if CPU usage drops, but no luck. Got to reseaching more and I landed here where. I checked for sensors and i noticed i did not swap the screen sensor from the old screen! I placed the sensor into the new screen, booted and it was working normal speed, cpu usaged drop below 3% and the fan was working at normal rpm.
So if you get similar error please check all temp sensors! :)
Hi I had the similar issue! This page did point towards a solution. After replacing broken screen of my Imac 27” late 2015, it was really slow where the system usage at idle was over 60% and the fan was at full speed 3600rpm.
On the apple troubleshoot scan result I got a error code PFM006. Which is an error related to CMS. I tried resetting the CMS, but no luck. I later after reading more a though I have damaged the HHD, so I opened to swap the HDD from another MacPro Desktop to see if CPU usage drops, but no luck. Got to reseaching more and I landed here where. I checked for sensors and i noticed i did not swap the screen sensor from the old screen! I placed the sensor into the new screen, booted and it was working normal speed, cpu usaged drop below 3% and the fan was working at normal rpm.
So if you get similar error please check all temp sensors! :)
Best regards,
Fredy