HT204156: About the screens you see when your Mac starts up
Learn about About the screens you see when your Mac starts up
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Helpful answers
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Feb 15, 2016 11:14 AM in response to makdaddykeshby leroydouglas,http://www.macissues.com/2015/04/07/tackle-your-mac-booting-to-a-gray-screen/
If you have an external bootclone you can try booting off that. If it boots fine then yes you can suspect the internal HD.
Otherwise you likely have a hardware problem that cannot be overcome on your own, and it is time to schedule a repair for your Mac.
In or out of warranty you can get a free '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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Feb 15, 2016 12:35 PM in response to makdaddykeshby lllaass,What happens when you boot with the Option key depressed?
Does the power light light?
Do you heat the fan?
Maybe this problem: