killjoy, thanks for reporting back your results. I got the exact same result as you in step #3 (white on left, good picture on right, no lines). I also tried swapping the cables in various positions to no avail. I didn't try only the right cables unhooked but i'm guessing mine will do the exact same thing (color patterns on left of screen).
oh well, it was worth the effort, thanks everyone for the suggestions and killjoy for experimenting so much...time to buy a 4K set
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