peaceofmind2020 wrote:
My MacBook Pro 2012 running very slow. I am curious to know what to do if I want to diagnose any issue with hard drive, ram, fan or other components are not functioning properly or need to replace ?
Thank you in advance.
Diagnostic is limited to hardware issues...
To get a good look at your System configuration and reveal conflicts or issues, you can download/run this trusted utility https://etrecheck.com
(there is a free version to use, Full Disk access gives the best insightful results—no personal info is revealed here.)
If you need help interpreting the report you can post it here in its entirety in the "Additional Text" box in the editing toolbar below, in your reply.