Dan we may be on to something??? I plugged in the vga cable that came with the amp and took a reading on the orange sync line on the amp. So the vga cable is connected to the amp and pc. I got 0.16vdc. Unplugged the vga cable from the amp only and get a reading of 3.45vdc on the orange wire connected to the amp and crt.

So before bypassing the amp I thought I'd check with you. Could it be the amp, the vga cable or both or none of the above? Thanks