Using WinDV, Digital 8 and Firewire, I capture TV programs. But there is a noticeable hum like there is interference or something needs grounding. There is no fluorescent light nearby and TV is off. Only the cable box, camcorder and PC are running. Many times I plugged and unplugged the cables to ensure the contacts. I am thinking the camcorder's audio/video input jack is bad. Thanks for any other suggestions/solutions.