Viewsonic 2235wm Screen Fli...

LCD is a few months old, initially displayed a horizontal band of mild interference travelling down the screen (rolling top to bottom), more so when warmed up. The power adapter on my Satellite P10 recently failed and I purchased a replacement (Coonix 120w). With the new power supply hooked up I am getting a pronounced increase in screen flicker, which frankly seems to be corelated with disk activity levels. I am using the VGA connection to the LCD (no DVI on laptop). Is this a case of signal interference, and could it be eliminated with a better sheilded VGA cable. Suggestions ?