I recently bought a Dell E228WFP for my G4 400 w/ 1.2 mHz upgraded processor. It has an ATI Radeon 8500 w/ 64 mb vram that runs the Dell and and an 18" Viewsonic CRT in extended desktop mode. The Dell is hooked up to the DVI. The Dell monitor has an annoying tendency to flicker, not by any means unusable, but it is distracting. Is this flicker product of and overtaxed video card or is it the monitor?