what happens when you alter the brightness control and contrast pot. If it gets worse (relatively speaking) as you increase the brightness my comments stand. If the brightness has no effect on the symptoms (per se) other than doing their avowed job look to the PC and connectors and video card. I would be happy to make the symptoms worse if it told me what was sensitive, but if it is the domestic situation that is the sensitive component, you have my sympathy. Ultimately you can ditch the PC without much angst. Give us some details when you have tried simple things like Desktop colours or brightness control.