ah. genlocking....
thats whats causing the tearing.
ferrites arent going to help.

see the computer monitor output doesnt run at exactly 75Hz.
its something like 75.02Hz.
dont ask me why, i cant change it.

this means that unless the scan convertor is very clever - and it sounds like this one isnt that clever...you get tearing as the genlock input goes out of sync with the dvi/vga input
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what kindof projection/output system are you using?