I am looking for a portable monitor for my SP3. I currently have a Lenovo LT1421 (I think) It is a cabled portable monitor that I have used on a laptop. It works fine when I am using the SP3 with applications on the machine, but as soon as I enter a virtual office environment all the VO apps don't work and the second screen goes blank. I also have an HP EliteDisplay S140U that I can use as well, but it just doesn't seem to want to cooperate at all under any circumstances. Any driver suggestions? Other suggestions?