Built-in screen not visible!
My Macbook air's screen remains black (so does the backlight and rear Apple logo) and remains not visible in the Displays System Preference.
An external screen works perfectly with the Mac, but it remains the only device visible.
I've reseted the NVRAM, SMC, reinstalled the system, nothing changes, the main screen remains desperately black.
An Apple Hardware testing (with my external display) indicates that nothing is wrong.
That surprises me as it should at least report that the internal display is not available...
I think that I've investigated all the software potential issues and now believe that I should open it to see if something is unplugged inside?
Any other suggestion from you experts?
Is this a good question?