MBPro with external monitor

Discussion in 'MacBook Pro' started by moochoo, Mar 17, 2008.

  1. moochoo macrumors newbie

    Jun 5, 2007
    Ever since i purchased my MBPro in june last year i have used external monitors on it while at work.

    When i arrived at work today i was having huge issues with the external monitor.

    To begin with the external monitor would not turn on at all. Once i was in OS X i was able to run the external monitor as long as i have the MBPro open.

    How ever it is only allowing me to run the external in the same resolution as the MBPro which is far lower than the external can handle.

    As soon as i close the lid the external turns off, then it enters a very strange cycle phase.

    The monitor will turn on for 2 seconds off for 10 on for 2, this just keeps repeating.

    Has anyone any ideas or is it a trip to the apple store?
  2. dops7107 macrumors 6502a


    Mar 19, 2005
    Perth, Oztrailya
  3. moochoo thread starter macrumors newbie

    Jun 5, 2007
    The monitor works fine in other machines

    its just the MBPro which doesnt seem to like sending the correct external signal anymore
  4. dmarch macrumors regular


    Nov 14, 2007
    Big Sky, MT
    This has worked for me... with your MBP off and external monitor plugged in, lift the lid on the MBP, push the power button and then immediately close the lid. The unit should boot properly to the external display. After this, if you want to use both displays, just raise the lid again and go in to system preferences, displays, and hit detect displays. Your MPB should now recognize both displays properly. This work around has worked for many people since the latest graphics update. YMMV
  5. adamfishercox macrumors 6502

    Aug 15, 2007
    If you boot up the MBP with a monitor plugged in, it runs the external monitor in the same rez as the MBP screen. Reboot, with the monitors unplugged, then once OS X is booted, plug in the monitors.
  6. eyeburn macrumors newbie

    Aug 1, 2007
    I have been doing this!!! I have the exact same problem. This is getting irritating to have to do this every time I reset my computer. ANyone know of a apple support thread that is referring to the same subject? I want to subscribe to it. Any workarounds to avoid this?
  7. LastZion macrumors 6502a

    Apr 13, 2006
    This is absurd. I mean I have been reading threads on this going back a month or so. Is there no solution by apple for this?

    All of a sudden, I guess I haven't used the feature in 3 weeks or so, but now I can't use any external tvs. Using the DVI/RCA to a TV (just to watch movies) and now it won't connect.

    Is this all the same problem?
  8. Chundles macrumors G4


    Jul 4, 2005
    Have you tried hitting F7 when the monitor is in to turn off the mirroring mode?

    Why haven't you spoken to Apple yet if you've had this issue for weeks?
  9. LastZion macrumors 6502a

    Apr 13, 2006

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