Have you tried the V6 box with a different TV?
Normally the black screen issue is caused by either a faulty cable or port, or incorrect port beiing used, or cables that aren't HDCP2.2 compliant, although this doesn't usually affect live TV.
With a V6 you can usually force the screen to reset and it will display in the basic 576p resolution.
This will allow you to go into the V6 settings and change the video output again.
Using your remote control press Thumbs Up, Thumbs Down, 4, 8, 0, Clear
You should now be able to see the screen again, so 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
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