Just updated my MacBook Pro, shut it down and it now turns on but shuts down

Hey guys just updated my software, my computer turns on the apple sign appears but then a loading bar opens, loads and then my computer guns off.
Help? Thanks

In that case, it's much easier to see if the hard drive is failing.
First, press Command and R keys while your Mac is starting to start into OS X Recovery, and open Disk Utility. Then, select Macintosh HD on the sidebar and repair the disk.
If Disk Utility couldn't repair the Mac, take the Mac to an Apple Store to get it repaired. If Disk Utility says that the hard drive was fixed properly, just restart your computer and you will be able to start into OS X

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