Hello, I have a similar problem. I have a viewsonic ls740hd projector. Laptop is connected to a 2nd monitor via HDMI extender and a cat6 cable to the receiver and hdmi cable to the projector. Its been working fine for the last 5 months that we've had it, and all of a sudden - no source found. checked all cables, checked connections, tried different cables, tried different laptop, and different hdmi extenders, still no joy! there isnt any firmware or software available for the projector that i know of either. Tried all i know. anyone know how to fix this ?? I've tried the above method too, no joy!