Vizio 50" P50hdm Audio with No Video

Question

The green light comes on, w/audio but no Video or menu screen. when powered off the green light flashes 10 times and turns amber. I have replace the power supply board and the main board, the result is the same. After a hard reset, a faint clicking sound can be heard however the cooling fans do not come on. Any suggestions as what to try next will be greatly appriciated.