IMac 2011 not start with lion or up

iMac 2011 (12,1) only starting with 10.6.8 (but slowly start with blue screen). It not start with lion or yosemite. Re starting with Internet recovery. downloaded, but not start. Only grey screen with apple logo.

Howdy umaxmac,
As I understand it you have successfully reinstalled both Lion and Yosemite but you cannot get past this gray screen when you try to boot the computer. I would recommend you use the troubleshooting from the following article about gray screen issues, named:
Mac OS X: Gray screen appears during startup
Thank you for using Apple Support Communities.
Regards,
Sterling

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