Sorry what do you mean by the Alt key.........there is no Alt key on my keyboard ........
Pretty sure we've deleted nothing........this is just my wife's machine which hardly gets used, and she is no computer buff.
One thing though.......don't know if it counts for anything........she stopped using it over a year ago because it became painfully slow..........and when I mean slow, 3 mins between keystrokes!
I thought an OS reinstall would fix this but maybe it has other problems?
Reset the NVRAM, though this is approaching desperate tactics. Read the following carefully and do not skip any steps:
- Shut down your Mac.
- Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the second time.
- Release the keys.
After resetting the NVRAM, attempt to start the MBA normally.
What do you see when you attempt to use Startup Manager? Hold an option key while starting your MBA.
This is an example of Startup Manager with an external disk and a DVD inserted - those will not appear.
Lastly attempt a "Safe Boot" according to the following: http://support.apple.com/kb/HT1564
If you have another Mac containing a compatible OS version on a bootable volume you can start it in FireWire or Thunderbolt Target Disk Mode and use it as a boot device for your MBA:
FireWire Target Disk Mode:
Thunderbolt or FireWire Target Disk Mode:
Thanks for the post but holding the three keys down on reboot didn't work. I didn't get the Starting Internet Recovery screen. My machine just tried to ( unsuccessfully boot into the OS).
Do you have any other ideas?
Your original post indicated "Macbook Air 2011." Macbook Airs, until mid/late-2011, came with OS 10.6 and did not come with recovery partitions. Only after August 2011 did they begin to ship with Lion, which did come with a recovery partirion.
The ones that shipped with OS 10.6 came with a thumb USB drive from which one can restore the machine to its original state.
If your machine shipped in late 2011 with Lion and you have no recovery partition, then I suggest that you follow the instructions here
to make a bootable USB jump drive that has the Mountain Lion installer. Then boot from that USB jump drive and erase your internal drive and install Mountain Lion on it. This will be basically restored to factory specs except it will have a more recent OS (10.8) instead of the original earlier OS.
I have followed the above instructions for making a bootable Mountain Lion USB install jump drive and they work and are extremely easy to follow.
If your machine shipped with 10.6 but you can't find the original thumb USB drive installer that came with it, then you can simply go ahead with the 10.8 install above.