I would disconnect the internal hard drive and boot from an external. This sounds to me like a hard drive/ IR cable issue.
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'''UPDATE 4/16/17'''
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Well I've got it too on the 15" 2011. Also have a 13" 2011 on the bench with the same issue. Here was my question on it. https://www.ifixit.com/Answers/View/385199/Getting+three+Beeps%2C+Not+RAM+error
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I'm going to see if @Rany can get anywhere with this one with his new high dollar equipment. Will try to keep you updated.
I would disconnect the internal hard drive and boot from an external. This sounds to me like a hard drive/ IR cable issue.
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'''UPDATE 4/16/17'''
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Well I've got it too on the 15" 2011. Also have a 13" 2011 on the bench with the same issue. Here was my question on it. https://www.ifixit.com/Answers/View/385199/Getting+three+Beeps%2C+Not+RAM+error
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I'm going to see if @Rany can get anywhere with this one with his new high dollar equipment. Will try to keep you updated.