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Helpful answers
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Jan 8, 2015 11:49 AM in response to ptswby benworkman,Hi! Did you ever find a solution? I just bought a 2013 iMac and have the same problem- except mine will allow a login after sleep after an initial freeze of 4-5 seconds. Dual monitors as well.
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Sep 29, 2015 6:45 AM in response to ptswby Philmnoir,I was having a similar problem and the solution posted at the bottom of the thread here worked for me. It was related to the system switching automatically changing graphics mode.