I have celeron 800Mhz with 815E motrherboard onboard VGA as well SIS 6326 AGP with win98SE OS. I have 15" viewsonic monitor. I observe ripples on the screen quite frequently. I have tried both AGP and onboard VGA. While trying with AGP(VGA+TV out), the ripples are seen simultaniously on TV screen. I have changed diff resolution with diff refresh rates and changed moire from monitor setting selection menu from min to max but ripples problem is still there. I have 2000W phillips 4pt speaker system has woofer 4 feet on top of monitors. is that creating this problem? is this harmful for monitor life? Has anybody faced this problem? I am looking forward for solution.