Has anyone come across this before? My 27" monitor only works with one specific cable. I don't understand how that can be. Its definitely a dual link cable, I've tried a few different ones that I know work on my other screen. M stumped. The monitor than does this a cheapie, but it still doesn't make sense. Any help would be dandy. P.S. - I need a longer cable to be able to place it where I want it.