Two replaytv 5000's acted up on me recently. One with the "No Signal Detected" message when tuning channels despite swapping every major component with known good parts. The other output pizilated live video, yet streamed video played fine. In both cases replacing the power supply to motherboard power lead solved the problem. Possibly what damages the connector is tugging the wires to break it free. It's wiser to remove it by grabbing the white plastic.