You may wait for the message to disappear or click "OK." After the phone shows in i Tunes, the software will reinstall your phone's apps, if you have any, and music.
Once the process is complete, the LCD-type display window in i Tunes will state "i Phone sync is complete.
After your Mac fully starts, restart your computer normally without holding any keys/buttons during startup. After dumping the trash, open a Finder info window on your hard drive (default name is Macintosh HD unless you gave it a different name.
Verify that this hard drive has AT LEAST 10 GB of available space.
Turn on your Mac and hold down the Command and R keys until you see the Apple logo.This white (or gray) screen means that your mac OS or OS X can’t start because of problems with the system’s hardware or software.