I just picked up a USB display adapter for my laptop to drive a third monitor. The make is: Diamond BVU160 USB Display Adapter It plugs in to the USB port. On the other end, it has a DVI/RGB outlet to plug in to the monitor. I found that the performance of this gadget is horrible. It flickers every second or so: It completely blacks out for about 0.2 second, then refreshes the screen display for about 1 second, then blacks out again - and the cycle repeats. Pretty much unusable. My question is - for those who has used a USB display adapter before: Is this flickering phenomenon inherant to the USB based display adapters? Or just that perhaps the Diamond make is no good?