Samsung 750s horizontal moving lines

New Samsung 750s monitor. while running Windows 98 used the
refresh rate "optimal" no problems. Just installed XP Home Edition and under Monitor the choices are 60 to 120 Hertz (no optimal setting). Set it at 60 and no screen flicker but have two sets of horizontal lines about 2" apart moving from top to bottom of screen. If I go above 60 I get flicker as well. System is 933 with 343 RAM

 

Welcome to TSG Forums
Have you checked to see if you have the updated driver for Windows XP? That would mostlikely give you the Optimal setting back. Also go into Device Manager and look under monitors and see if it lists your monitors or does it say Default Monitor?

 

I went to the Samsung home page and downloaded the XP driver for this model. Clicked on it and installed it. Nothing has changed. I did note that if I set the screen at a higher setting above 800x600 the lines stopped but they are still present. Using Aida32 system information program, the Samsung 750s is shown as installed.