I have the HP w20 TFT monitor on my main system and I use the DVI connection resulting in a perfect picture but with my second system I use D-Sub and I often see flickering/shimmering. I have another HP w20 and it's the same. I've tried fiddling with the settings to no avail and it's really starting to annoy me. 
Is this indicative of all TFT's with D-Sub or is perhaps my monitor is faulty?
TIA!

Is this indicative of all TFT's with D-Sub or is perhaps my monitor is faulty?
TIA!