I had to buy a couple of different ones to get a good one, also the 3m ones I tried I could not get to work 100% all the time (random black screen for 2 seconds every week or so)
I did find a post online about it detailing something on how to deal with it
Basically power up screen and PC but with cable display port cable disconnected, after 1 min stick in the cable between the PC and screen
Seems when they first "hook up" up there is some hand shaking that goes on and they both work out how to talk to each other correctly