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If your Mac doesn't start up

If your Mac starts up to a flashing question mark but then doesn't continue
starting up, try these steps.

1. Turn off your Mac by pressing and holding the power button for a few
seconds.
2. Press the power button once to turn your Mac back on. When you hear
the startup sound, immediately press and hold the Command and R keys on
your keyboard to start your Mac from OS X Recovery
<https://support.apple.com/kb/HT201314>. Keep these two keys held down
until you see an Apple logo or globe appear.
3. If prompted, select a Wi-Fi network to connect to the Internet as
part of startup.
4. After the Recovery screen appears, click the Apple menu and choose
Startup Disk.
5. Select your startup disk, then click Restart.


--
Joan K. Mayer
Rosemont Seneca Partners
o: 202-333-1880
m:202-841-854