Fender Passport Deluxe

1. I have a Fender Passport Deluxe 250 and a projector. I mounted my 2 fender speakers (with 1/4 cables) in the corner of the room. I used one 100 foot cable for each speaker to connect them to the fender. Once connected, I hear a very loud humming/hissing sound coming from (I think) one of the two speakers (left one).

2. On my projector, I have two 50 foot RCA gold plated cables connected with some silver colored adapters running to my Comcast box and DVD player.

When I watch a show or DVD, the sound coming from either the projector and/or the two fender speakers have buzzing noses. And the picture on the projector has a black line running up the screen.

Can anybody please help!!!!!!