My son's computer MacBook Air A1466 was inactive for 1 month and when we restarted it recently, the screen always comes up black.
The CPU is OK, since we can hear the bootup beep.
We tried the following suggestions with no luck:
2) Keypress Sequence to Ditch the Black Screen
Unfortunately, none of the three suggestions work.
I was wondering if there is anything else to reset or bypass.
If it is a hardware problem, what should I be testing and how (i.e inverter, LCD panel, etc)?