I was updating my macbook air to Yosemite. When I almost finished the update, my battery died. I've charged my laptop, but it won't turn on again. The screen just stays black. What should I do?
MacOS – Macbook air yosemite update
macbook promacossoftware-update
Related Question
- MacBook – Debugger
on MacBook Air - MacOS – MacBook not responsive when woken within the second it went to sleep
- MacOS – My battery died toward the end of Yosemite installation. Now login screen freezes
- MacOS – MacBook Air running Yosemite won’t shut down when external HDD connected
- MacOS – Accessing Apple Hardware Tool on MacBook Air 2010 running Yosemite
- MacOS – My battery died while El Capitan was installing
- MacBook Air damaged after update
- MacOS – New MacBook Air – update installation failed
Best Answer
During Installation Yosemite also installs a Recovery partition on your disk.
You might be lucky and it has finished that job before the lights went out.
You could try to call it up by restarting while holding cmd + r
If that did not work, you will need a external Yosemite.
Using a USB stick with bootable Yosemite you can reinstall it on your Hard Disk.
How to get it?
From another Mac, from a friend, from Apple Store...