Mac Mini not displaying on two screens - was fine, but now it is not!
Hello,
At my work we have a Mac Mini running Keynote with videos and various slides looping round, displaying on a LG 42" LCD screen in our display window. On the other side of the window - the bit the public does not see - is a monitor to start the presentations and run the computer.
This was working fine, running both screens simultaneously. However recently, it had to be turned off to carry out some work in the display area, and a few days later upon setting it up again its not working with both screens.
The mini boots up and will run fine @ 1024 x 768 60hz on the inside monitor. This is connected to the mini DVI port, with a DVI to VGA adapter. However, when I plug in the LG 42" LCD at the same time (Connected via the mini display port, to an HDMI connector/adapter, the monitor will change to display an "out of range" message, while the LG will display as normal.
I really need both screens running simultaneously as they were before! Nothing has changed in the setup and both screens will run fine by themselves, so I know that they are functioning correctly.
Any suggestions are much appreciated!
Any thoughts
It sounds like perhaps the displays got set to mirror mode somehow. This means both displays are trying to display the same thing instead of working independently as you want them to.
Which screen is set to primary, e.g. which one shows the menu bar when both are active? Are you able to get into Displays preferences and make changes? If so, I would check the mirror setting.
Something else that may be worth trying is to start the mini in Safe mode with both displays connected. Hopefully the result will be useable screens on both displays. If so, go into Displays preferences and set the respective displays to the desired setting and restart normally. The selections made under Safe mode should persist through a normal restart.
http://support.apple.com/kb/HT1455
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