I have a Barco Data P/C (R9000280). Produced jan 1987. The problem is that it won't light up. It's connected to a RCVDS 400 S QUAD. When I push the "on" button the fan starts and a pulsing noise follows as long as it's powered up. I think the noise comes from de second card, the one right after de first power-card. If I disconnect the Remote-cable the pulsing noise stops, but it won't light up anyway. I have no unit connected to de RCVDS. Only the Remote, RGB and Sync is connected between the PJ and den RCVDS. Internal Pattern is selected on the conv. board. What can be wrong?