I have 2x 23" viewsonic screens with the same fault. They turn on then the picture goes off. The screen is not going into standby mode and if you shine a light onto it you can see that the screen is on but no light. So. Is it the bulb is it the inverters or is it the main board not telling the inverters to work properly as it seems a little strange that these babies have knocked out 4 inverters and 4 bulbs (2 per Screen) have tried different PC's and connecting them digitally. But then if signal was the problem then the little green light wouldnt stay on. Can any body Help??