Projector has a purple screen?

I have an Epson emp-s4 projector that I use in my classroom. When I plug it into my computer, the output shows my computer screen like it should, except that it is purple. I have checked it with another computer as well as another cable and have found that the same thing is occurring. I know that the computer... show more I have an Epson emp-s4 projector that I use in my classroom. When I plug it into my computer, the output shows my computer screen like it should, except that it is purple. I have checked it with another computer as well as another cable and have found that the same thing is occurring. I know that the computer and cable that I used from another teacher works fine on their projector as well as mine does. This means that my projector is faulty. What can I do to fix this? I have checked the contrast, color, and tint, etc. and they all are set to normal. Is this problem correctable or do I need a new projector or a new lamp bulb?
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