Audio/Visual wireless/physical connection for PCs and MACs

Dan used Ask the Experts™
I'm having a lot of problems with both PCs and Macs being able to display their computers to the projector.

I'm looking for a simple solution that ALWAYS works, whether a MAC or A PC, where I can connect both via wireless/physical connection to a projector, or large screen TV, we currently have a projector, but I can replace it if necessary with a full 1080P, as it only support 720p.

Any ideas of the different products I would need to configure a rock solid system?  

Currently I'm using an Aten VS-0202 switcher, with an apple TV, and the projector, and people constantly are having issues.

How can I replace all these with something that actually works?
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