My Infocus LP720 has recently developed a large number of vertical red lines running across the entire picture. I've racked up about a thousand hours on the lamp and have not had any problems before. I get the same result whether connecting to a DVD player or to a PC. I've tried cleaning the bulb and anything else I can get my hands on, but still can't seem to fix it. I've followed the troubleshooting instructions in the manual but to no avail. Does anyone know what the problem is, or how it can be fixed (cheaply!) Any help greatly appreciated.