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Helpful answers
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Mar 24, 2016 12:30 AM in response to PissedOffGunownerby Mati_mat1,visit this site, it should help
http://appletoolbox.com/2015/10/mac-os-x-el-capitan-will-not-start-up-after-upda te-fix/
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Mar 24, 2016 12:31 AM in response to PissedOffGunownerby D.Cohen,Hi! Maybe this Apple Support article will help you:
About the screens you see when your Mac starts up - Apple Support
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Mar 24, 2016 5:15 AM in response to PissedOffGunownerby OGELTHORPE,Have you tried a SMC reset?
https://support.apple.com/en-us/HT201295
Depending upon the model/year MBP that you have, the problem may be covered here:
https://www.apple.com/support/macbookpro-videoissues/https://www.apple.com/support/macbookpro-videoissues/
Ciao.