mac pro
what are the key strokes at start up to get into the diagnostics. one where you hold down keys until you hear the chime?
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Click on this link, Use Apple Diagnostics to test your Mac – Apple Support
If you have a Mac Pro read the Intel section.
If you have a newer MacBook Pro with a silicon chip read the Silicon section.
Olde Mac Pros would have come with two grey install disks one of which would
have included the Apple Diagnostics.