If you come to a computer and find that the screen is blank (or not showing your desktop), the chances are that you have a projector connected to that computer and the projector has become the "main screen" and the desktop screen has been "lost" or "extended".
To fix this,
1) turn on the projector so that you can see the other screen.
2) once you can see the screen, use the Windows-P keys 
to bring up the projector dialog box:
to bring up the projector dialog box:
and make sure that "duplicate" is selected. You should then get your screen back.
A related thing to note is that when people present PowerPoint presentations, PowerPoint will change your set up to "Extend", but will not change it back afterwards! This means that you will have to do "windows-P" afterwards to go back to "duplicate". Also, if you want to hide what you are doing on the screen from being projected, you can use "windows-P" and choose "computer only". To show the screen again, change to "duplicate"
If you are getting a black screen repeatedly, then please send a message to help@smus.ca and ask to have your primary display set properly.
If you have any questions, please feel free to ask! If you have any suggestions for future tips, please let me know.
cheers
Mike
Michael Jackson, Academic Technology Coordinator
St Michaels University School
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