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Current version by: mayer ,

Text:

Did you perchance change the hard drive and not install the required thermal sensor (this will cause run away fan issues).
 
What system are you running and did this happen after you attempted a system upgrade?
 
Will it boot from an external USB source running a maximum of Sierra?

Status:

open

Original post by: mayer ,

Text:

Did you perchance change the hard drive and not install the required thermal sensor (this will cause run away fan issues).

What system are you running and did this happen after you attempted a system upgrade?

Status:

open