I don't have any issues with my 25' HDMI to DVI cable I got from www.monoprice.com but I have heard some people seeing what is referred to as sparklies in their picture when using long runs to a Front Projector. Many times it is the quality of the cable, but I came across this website recently that may help those having this problem.

http://www.gefen.com/kvm/product.jsp?prod_id=2937

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