VGA connection flashes between computer display and red screen
I have my projector connected to my iMac with a mini displaypor to VGA adaptor and a VGA cable. It has worked for three years but now suddenly is alternately flashing between the computer display I want and a blank red screen. I bought a new VGA cable, and I've checked the connections thoroughly. Any suggestions?
Office Equipment & Supplies - Vivitek - D825MS Projector