Sony Playstation 3 (PS3) Console "benq tv sound" Questions

BENQ). i am using a tv box to use the monitor as a television. my problem is the monitor has 3 inputs...vga,,,dvi and hdmi....the tv box has pc/tv/svideo. so when i change input on the tv box i get tv

flashing a benq now computer wont recognise it,when put to tv goes through the motions but there is no picture or sound what to do? You bricked the board -- do you stll have the key from the old board