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Try unplugging the TV for 5 minutes, then connect a device to it, e.g. a DVD player, and select the correct input for that device.
Let me know if you can see a picture ok.
If not, let me know if you can see the on-screen menu ok.
Reply back here with the results...
That's good advice. I will have to get back to you. Right now we don't seem to have an S video cable to do the connection to the dvd player. But that would be a sound way of isolating the issue.
That's ok, just reply back when you are ready :)