Rmbp with Yosemite beta 3 won't boot

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i have 2014 mbpr purchased in july. installed yosemite beta 3 , right after installed mac refused boot. hear boot sound , screen stays black light still on. tried pram reset , other reset still cannot fraking thing boot. have ideas or have visit apple store. in advance
 



Forums Macs macOS OS X Yosemite (10.10)


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