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La linea di computer portatili MacBook Pro di Apple per utenti avanzati e professionisti. La linea MacBook Pro include varianti da 13, 14, 15, 16 e 17 pollici, e le revisioni principali sono definite da Pre-unibody (originale), unibosy, display Retina, Touch Bar e SoC (system-on-a-chip).

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ALT (Option) Has Disabled From MacBook At Startup & stay working in OS

ALT (Option) Has Disabled From my MacBook Pro At Startup i cant Load Startup Manager with this button But it working in OS but in startup (Power on) doesn't working.

i cant use Reset NVRAM (CMD + ALT+R+P ) because ALT don't stay working at boot

if i try reset NRAM MacBook go to Recovery Mode not NVRAM mode because it read only (CMD+R+P) not read (CMD+ALT+P+R)

i think ALT Disabled from my MacBook pro because i try Some Command last days like i disabled "SIP".. i enabled it again and no result ALT stay not working..

Please Help me i want boot with USB device for Install Mac OS to another Partion in my Hard Drive...

Update (12/20/2016)

Thanks Dan & Bob but my problem not in startup manager the problem in ALT button does't work at Bootloader but it stay working in OS.. I try an external keyboard and not working too

i thank ALT disabled in my MacBook because i used some commands in terminal last days like i disable "SIP" and something like that and ALT button has disabled from my MacBook.

how i can reset all configure to enable ALT again ?

Maybe OS was disabled this button in startup ? if i remove partition ALT reset to work ?

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What is your current OS on your system MS Windows?

da

OS Sierra 10.12.1

da

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I think you're going to need to bring your system to an Apple Store to have them take a look at it.

I've never encountered a keyboard issue like you describe here. The systems firmware doesn't have any means to over-ride the keyboard at boot that doesn't still have problems after the boot up.

The only thing I can think of is the keyboard firmware needs updating. Review this Apple T/N: About EFI and SMC firmware updates for Intel-based Mac computers. Make sure your systems firmware is at the listed level or newer. The OS installer should have updated it but I've seen a few cases the installer failed to install the needed updates. Which is why you'll need to visit an Apple Store as they have some tools to force it.

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Thanks sir i will try update EFI and SMC if does't work will go to Apple Store to give me solution, thanks again

da

SMC Update was installed.. but EFI update tell me "This update requires OS X version 10.8.5 or 10.9.5" i must use OS 10.9.5 for this update ? i cant use it in mac sierra 10.12.2 ?

da

Sierra has a newer update within the OS installer. The point here was to check before you applied "Make sure your systems firmware is at the listed level or newer"

da

My Update list is MacBook Pro (15-inch, Late 2011) / MacBookPro8,2 i downloaded last Update from your link.. so what i do now sir ?

i must use OS 10.9.5 for install this update ?

da

OK, lets do this, can you give me what your systems levels are looking at the report.

da

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Ayoub sarà eternamente grato.
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