My mac book pro won't work. it starts up and then turns off

My mac book pro starts up & then turns off. I know the memory was almost full so I bought an external storage and was going to start removing pictures to make more room, but now it won't let me work on it. it just turns right off. It's not the battery. has anyone had this problem? thanks

Hello Marcela100
Check out the article below for troubleshooting startup issues on your Mac.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://support.apple.com/kb/ts1417
Thanks for using Apple Support Communities.
Regards,
-Norm G.

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