You could try the following which should force the V6 screen to reset and therefore should also hopefully work on the Tivo and display in the basic 576p resolution.
Hopefully this will allow you to go into the tivo settings and change the video output again.
Using your remote control press Thumbs Up, Thumbs Down, 4, 8, 0, Clear
Fingers crossed you should now be able to see the screen again, if so then using your remote
- Press Home > Help & Settings > Settings > Video Output > Video Output Format
Either go to Auto detect to run a test of your TV’s display options. It will then ask you to confirm the new display selection or choose Test Formats to run a quick test on the Virgin TV V6 box and follow the onscreen guides
If that fails you may need a replacment box. Faulty Tivo's are now being swapped out for V6 boxes providing you also have broadband via VM.
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