Wavy lines on projector from iMac

I have connected my iMac 27" to a projector connected to a Promethean Board and am getting wavy horizontal lines going down the screen.  What can I do? This does not happen with other Mac or PC devices. Can I change monitor refresh rate?

Chad3405 wrote:
No one else has this problem?
If they do, you'll probably find them in the Boot Camp forums:
http://discussions.apple.com/category.jspa?categoryID=237

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