Issue with Toshiba 36HF72 television ...

I was wondering if anyone can assist me with a problem I've been experiencing with my Toshiba 36HF72 television. I have a Scientific Atlanta Explorer 8300HD cable box/DVR via Time Warner. When I hook the box into either ColorStream HD-1 or HD-2 port, I get a very high pitched humming/whining noise, similar to what you'd experience during a hearing test. The noise seems to be coming from the green (Y) video cable, because it disappears when I pull out the cable. I don't get the hum if I use the Video-1 or Video-2 ports, however. I also do not get the hum if my Toshiba Progressive Scan DVD player is hooked into either ColorStream port. At first, I thought the noise was from the cable box, but when I swapped it out, I still had the same issue. The hum remains, even if I power off the cable box, so I know it's coming from the television and is there about 75 % of the time. The HD picture is excellent, even for this older model TV, but the humming noise drives me crazy, especially at lower volume. It's like torture. Has anyone heard of this problem?!? Thank you.

I would get another box. Since your dvd player does not cause this, it is probably your box.