Skip navigation

Plugging in printer makes my second display dismount..???

121 Views 2 Replies Latest reply: Nov 25, 2012 1:44 PM by den.thed RSS
ac1981 Calculating status...
Currently Being Moderated
Nov 25, 2012 4:56 AM

Hi there,


I have a Philips monitor as a second display for my iMac. Whenever I plug in my printer to one of the iMac's USB ports (haven't sorted out a wireless connection yet), the second display automatically dismounts. To get it back I have to unplug the printer, then disconnect and reconnect the mini-display port connector for the second monitor.


Any ideas why this would happen? Can't think it's a power issue as both the printer and the monitor have their own power, and this doesn't happen when I plug in flash drives and other devices using the USB ports.


Any help with this annoying problem would be much appreciated!


iMac (21.5-inch Late 2009), OS X Mountain Lion (10.8.2)
  • BDAqua Level 10 Level 10 (114,755 points)

    Sounds a bit like it might be a Ground loop on the Printer.


    Open Console in Utilities & see if there are any clues or repeating messages when this happens.

  • den.thed Level 7 Level 7 (23,325 points)

    Sounds to me like you are either disturbing the power to the Mini DisplayPort or actually moving the Mini DisplayPort plug causing it to lose connection


    I suggest getting a Mac compatible 4 or 7 Port Hub to hot plug your printer and other USB devices into. That way you will not have to reach around to plug in USB devices and/or disturb other connections.

    iMac, Mac Mini, iPad, iPods, Mac OS X (10.6.8), (10.8.2), Safari, iTunes, iPhoto


More Like This

  • Retrieving data ...

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.