Why won't my Mac recognize my screen as an internal monitor?

Yep, this is a common issue! Apple threw us a gutter ball!

A new virgin display assembly needs to be calibrated for the brightness, camera, & TrueTone to work properly!

Now reach into your pocket do you have the needed magical tool? NO!!! And you can't get it either!!!

You'll need to visit an Apple Store or authorized service center for them to calibrate it. Sadly, most won't do it as its not the part assigned to your system and Apple wants to lock out back of the truck parts sales. If they are willing it will cost you a bench fee!

OK, so is there a way I can replace the display without this mess??

Yep! Getting a USED part! Its calibration will have been done so no worries!

Sorry fo the bad news ;-{