I installed the update to the OS and now my computer does not finish booting up. Tried everything to no avail
What can I do boot up my computer after the installing the latest update to OS
MacBook Air, OS X Yosemite (10.10), Just downloaded Yesemite
Start by telling us what you have tried so we don't waste time explaining tests you have already tried.
It would also help to know more about the symptoms - what screens do you see on startup? Do you get to the login window? Where does it stop booting?
About the screens you see when your Mac starts up - Apple Support
Also do you have a backup? If so what kind? How recent is it?
