can't boot past chime

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Apr 2, 2015
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When I turn on my imac, it chimes and then stays on a gray screen. I have tried to use command r, shift, and cleared the pram several times. Any suggestions
 
Joined
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Location
Brentwood Bay, BC, Canada
Your Mac's Specs
2011 27" iMac, 1TB(partitioned) SSD, 20GB, OS X 10.11.6 El Capitan
We don't know what Mac model or OS it's using, and I guess you've read the Apple kb article?
Mac OS X: Gray screen appears during startup
https://support.apple.com/en-ca/HT204325

Have you got a compatible bootable drive you can use to test it??

Have you tried with any and all not needed peripherals disconnected, or using a Safe Boot Mode??

Got an Apple shop or good Apple Authorized shop close by you could take it to???
 
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Hold down the Option key at start up before the chime and see if the Boot screen comes up.
 

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