Q: MacBook Air won't start after update
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May 21, 2015 12:51 AMby D.Cohen,Follow the steps suggested by Apple in this article:
https://support.apple.com/en-us/HT204267
Also, try these steps.
- Shut down your Mac
- Wait until your computer turns off and after that press the Power button
- Right after you hear the startup tone, press and hold the Shift key
- Release the Shift key when you see a grey Apple sign and the progress bar below this sign
- Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)
- Click on Verify Disc and then, if asked to fix problems, on Repair Disk
- After this, click on Verify Disk Permissions and then on Repair Disk Permissions
- After the process is finished, shut down your Mac and turn it back on after about 30 seconds
Hope this helps! -
May 21, 2015 3:19 AMby OGELTHORPE,Try resetting the SMC and the NVRAM:
https://support.apple.com/en-us/HT201295
https://support.apple.com/en-us/HT204063
Ciao.
