Macbook Pro won't startup after 10.9.1 update

Early 2013 Macbook Pro 13" retina running Mavericks.
Installed the 10.9.1 update and left it to do that and when I returned it had restarted in Bootcamp in Windows 8.1
Requested in Windows that it startup in OSX. On starting up OSX a message came up saying there was a problem starting.
It tries to startup a couple of times then a circle with a line though it comes up and it goes no further.
Tried booting into recovery mode to check permissions etc. in disc utility but that's not coming up either.
Any suggestions on what else to try?

Chose startup disk manually:
Hold the Command button during startup, then select your macintosh partition.
Reset the nvram:
Turn on your mac while holding Command-Option-P-R until the chime sounds for the second time.
Safe boot:
Boot while holding down the RIGHT shift button.
If you have a Time Machine, you can use that to restore.
Reinstall via recovery:
Hold down Command-R during boot, then hit reinstall in the menu.
Other than that, you'll have to go to a Genius Bar.
Hope this helps!

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