MacBook won't boot after installing beta and restarting

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well annoying, macbook installed beta, went through set , needed restart. did , won't boot @ all.

shows progress bar , half way shows circle line through it.

help. not sure do.

picture

http://postimg.org/image/6s4v1i0cb/
 

help?
 


Forums Macs macOS OS X Yosemite (10.10)


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