My dock sometimes won't launch when start up.

Hi , my Imac with OS X Maverick sometimes when I start my Imac & the dock won't launch ?
But I'm not used automatically hide & show the dock.
Anybody knows ? What wrong with my dock ?
Thank you.

Take it in for a free assessment
'Apple Service Diagnostics' test
Genius reservation http://www.apple.com/retail/geniusbar/
on-line https://getsupport.apple.com/GetproductgroupList.action
check warranty https://selfsolve.apple.com/agreementWarrantyDynamic.do

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My dock sometimes won't launch when start up.

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