Hum from DVD video cable

Can almost guarantee that it is a ground isolation problem from you CATV connection, which derives its ground reference from a different source than your local electrical ground. Therefore, your audio system and video system are seeing two different ground potentials: a nice annoying hum.

I just solved a similar problem with the simple insertion of a small ground isolator made by Jensen Transformers (~$50-$60) into the video coax. It is completely compatible with digital cable television and HDTV as well.

Good luck.

I agree with Murphthelab that if you have Cable TV coming into the mix, it is likely the problem.

I used a simple solution from Radioshack. I am at work on lunchbreak so do not recall the exact connectors required, but they were about 5 bucks total cost and it works perfectly. Simply a connector you put on the cable line where it comes into the house, which goes between that cable and another cable run to your TV. It somehow fixes the problem and does not require you to you use cheater plugs on any equipment.

I am sure someome here knows the exact names of the coax adapter/connectors to use.

Lkdog's solution is also valid (previous posts have provided some details, also search the Net), but NOT if you are using digital cable service. The bandwidth is not adequate. In either case, you would in effect be implementing a ground isolator.