13'' 2011 MacBook Air: Stuck at blank gray screen, no boot option working I have a 13" 2011 MacBook Air A1369 stuck on a grey screen. When I startup I can hear the chime and the computer proceed to go to a blank gray screen immediately. The screen has no Apple logo or loading bar.

What I have tried till now:


Booting in recovery by holding Command + R -- no effect, blank screen.
Booting in single-user mode by holding Command + S -- no effect, blank screen.
Booting in verbose mode by holding Command + V -- no effect, blank screen.
Booting in Safe mode by holding Shift -- no effect, blank screen.
Booting in hardware diagnosis mode by holding D -- no effect, blank screen.
Resetting PRAM by holding Command + Alt + P + R -- no effect, blank screen.
Resetting SMC by holding Shift + Alt + Control while pressing the power button, then pressing the power button alone -- no effect, blank screen.
Choosing another booting drive or recovery partition by holding Alt -- no effect, blank screen.


Is there something else I could try to get past this gray screen?
I have found the problem, the BIOS firmware was badly corrupt from a failed macOS update, i had to fix it hardware removing the BIOS chip and flashing it again, now it's working perfectly!