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Helpful answers
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Sep 7, 2016 8:05 AM in response to drshahravanby JimmyCMPIT,shut down
disconnect all external devices and cables from the computer
Reset the PRAM reset pram
then reboot into safe mode Try safe mode if your Mac doesn't finish starting up - Apple Support
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Sep 8, 2016 11:23 PM in response to JimmyCMPITby drshahravan,THX for your attention,but it didn't solve my problem.I try install new os x for my MBP,but again the problem remained.fortunately i touch withheld pressure on CLUTCH COVER and suddenly my display appeared and there isn't any problem after that!!!!!!!!!!!
I found my problem maybe happened cause of some pressure on my MBP during my recent travel.
My new question is ,need i replace some part of my MBP?