My friend has a flickering monitor and I was wondering what I could do to the refresh rate. Right now, he has a tnt 2 pro on a P4 2 GHz (yeah I know, I told him about that) with a 17 in monitor. I read somewhere that if the refresh rate is too low or too high the flickering becomes rolling bars or something. It says 46.8/75hz on the monitor status screen, is that too low?