Harman Kardon HK19.5 Computer Speakers "wont tv work connected" Questions

...wont work with this tv as its connected to the pc. just bought the tv today, tv's model is Sansui SLEDVD244. plz halp me yall :-( the sound wont work with this tv as its connected to the pc. just ...

...wont manually turn on with tv button or remote - help? also how do you check power cord to make sure the AC/DC adaptor still works? TV is Westinghouse 50" LED, model 4655VX. Check tjhe voltage output ...