first-timer here hoping for help from the hive-mind!
I have a late 2010 MBA (3,1) running Mountain Lion
SMC 1.67f9 Boot ROM (EFI) MBA31.0061.B07
I bought it from a friend with Bootcamp/Windows installed and everything was fine.
Then I decided to be clever and free up some space by erasing the bootcamp partition via Disk Utility.
As soon as I did that, the built in keyboard and trackpad haven't worked. No light on Caps lock button. Power button is the only one that works. USBs are OK. No other problems.
I'm thinking the EFI has been slightly corrupted or a boot setting is still looking for Windows drivers for those two IO devices.
What I've tried:
Took it to Apple Genius Bar - they replaced the trackpad controller board (I told them that wouldn't fix it). No change.
Reset SMC, PRAM multiple times. No change
Upgraded to Mountain Lion from Snow Leopard. No change
Installed rEFIt - tried some utils. No change
Software update doesn't find any required updates.
Tried reinstalling recommended EFI (2.3, I think) - error message is (This software is not supported on your device)
Tried reinstalling SMC - same as above
Help!! - I'm at my wit's end. I'm convinced that if I can flash/reload the correct EFI, it will fix the problem. Is there a terminal command that'll do it? I'm moderately OK using the Terminal.
I must say though, the Apple Store was very reasonable in not charging me the $109 for the trackpad controller board and labour. Of course, they couldn't fix the issue...
I'm trying a full wipe of main partition and recovery re-install now (it's installing to Lion for some reason). I'll be sure to update this thread either way.
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