Dell 2715 4k w/ 5k iMac failure

Discussion in 'iMac' started by cschmelz, Feb 24, 2016.

  1. cschmelz macrumors 6502

    Jun 6, 2007
    So I had used a 24" old cinema display with adapter to mini display port for years with my old 2010 iMac 27"...Worked great.

    Finally upgraded to a late 2015 5k 27" (refurb) a few weeks ago. Works great.

    When I first hooked the Cinema display up to the 5k it worked fine, then it wouldn't work, display just stayed asleep. Moving mini-display adapter from 1 TB port to the other results in no change. TB port works fine (both of them) because I can use a TB to Firewire 800 adapter to get my firewire drive working.

    So I decide it is monitor....It is ancient. So I buy a 4k 27" Dell display. Plug it in, worked great. One reboot later, instant power save mode, nothing

    SMC reset, nothing
    PRAM reset, nothing.

    What the heck is going on???

    Overheat? Bad hardware?

    Isn't making a lot of sense to me.
  2. cschmelz thread starter macrumors 6502

    Jun 6, 2007
    So far so good after runnning a Cocktail autopilot run on it (which repairs permissions, deletes caches, etc) my guess is some sort of issue with the Migration Assistant pulling something corrupt or old over?

    Knock on wood, seems to work now.

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