New Macbook Pro turns off with external monitor attached

Discussion in 'MacBook Pro' started by macbook123, Feb 6, 2017.

  1. macbook123 macrumors 68000

    Joined:
    Feb 11, 2006
    #1
    I have a new TB 15.4" Macbook Pro. It works with my 4k TV (Vizio) if that is attached via USB-C to HDMI, but it doesn't work in clamshell mode with my 4k Monitor (Dell) if that is attached via USB-C to DP: after a few seconds the DP signal is lost and the laptop seems to have gone to sleep. Is this something that could be modified via settings or do I need to send it back?
     
  2. MarkZ3 macrumors newbie

    Joined:
    Feb 3, 2016
    #2
    Do you have the power plugged in? With the MacBook (12") it only works in clam mode with the power plugged in. Not sure if it changes anything for the 15".
     
  3. andy9l macrumors 68000

    Joined:
    Aug 31, 2009
    Location:
    England, UK
    #3
  4. macbook123 thread starter macrumors 68000

    Joined:
    Feb 11, 2006
    #4
    Thanks, I'm embarrassed to admit that I did in fact not have power plugged in.
     

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