Imac nvidia graphics card cloning

We have several new imacs and are experiencing the same problem with the clone on the windows side. They are connected to projectors via the mini display port. The poblem is the clone will just shut off during a power point presentation and it shuts off when a screen saver activates or it goes to sleep. Any ideas out there? Mac says it's a Windows issue and Microsoft says it's a Mac issue.
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More about imac nvidia graphics card cloning
  1. Turn off screensavers and deactivate the sleep mode, surely?
  2. Buy a PC.
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