You problem lies in the inverter board, this is the part that powers the cold cathode lamps to iluminate the dispaly. A common problem is bad capacitors check all capacitors on inverter and main power board look for bulges and brown leakage, replace all bad with 105 electrolytic high quality caps, make sure you check the value on each capacitor before you change them, you can buy these from maplins. Then monitor should work fine. If you are not technically minded then leave this for an engineer
jimski
September 2007