I would check the P/S. One of the rails might not be working now and it is not supplying power to the video side. There is a nifty little tool that allows you to check all the connections out of the power supply, then you will know for sure if the P/S is still OK.

http://www.newegg.ca/Product/Product.aspx?Item=N82E16899887005


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70