I have two Velodyn subwoofers hooked up to the 990. Both of they have stopped working all the sudden. At about the same time, or shortly thereafter, I am no longer able to access the video output to my T.V. to set-up the speakers. when I was able to and ran through the speaker set up it did not show any sub-woofers. I double checked hookup, power, etc. and that is fine. Help! Any Ideas? Thanks in advance. If software do you think installing the new version would do anything. I have not installed it.