MacBook under mavericks doesn't want to start up!!

Hello! My 6 year old mac is running under mavericks. However when I started it this morning doesn't open and when I try to restore, the disk is locked ... Can someone help me out because all of my data is inside and I didn't back them up.

Hello Shanniebravo,
Thank you for using Apple Support Communities.
For more information, take a look at:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
Perform a Safe Boot
Simply performing a Safe Boot may resolve this issue.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Start your Mac, then immediately hold the Shift key
Have a nice day,
Mario

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