The location and the position of the monitor may influence the quality and other features of the monitor.
If there are any sub woofer speakers near the monitor, unplug and relocate the sub woofer to another room. Remove all electronic devices around the monitor such as radios, fans, clocks and telephones that are within 3 feet (1 meter) of the monitor. Also you can purchase another video cable with thicker shield VGA cable.
If you have additional questions or require further assistance, please contact Samsung Customer Contact Center on 0800 SAMSUNG (726 786) to speak to a product support specialist.