When I turn on my laptop it looks as if it's updating. When it finishes loading it shuts down?

When I turn on my laptop it looks as if it's updating. When it finishes loading it shuts down?

...looks as if it's updating...
Do you mean it shows a thermometer bar, and progresses part way across the screen, then shuts off?
This is caused by a Boot Drive that has become damaged, and cannot be mounted. It is doing the equivalent of a Disk Utility (Repair Disk) before it attempts to mount the drive again.
--If it passes, it will boot up.
--If it fails, booting is impossible, so it shuts down.
You will need to boot to an alternate system drive or an Installer DVD or a Recovery_HD and attempt a Disk Utility (Repair Disk) from there.
If the damage is severe, you will need a new Drive (and an external enclosure to hold it), Install Mac OS X, and once everything is working again, then you can attempt to salvage and possibly rehabilitate your old drive.

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