Hmm. This has not happened to me. Have you tried swapping another tube? Use a cheap one, just to test.
How comfortable are you with repairing electronic devices? If you think you can handle it, try posting your question here:
I tube swap often. It's the same across the board.
I heard that Red LED is a weak link and may need to be replaced?
I'm out of that terribly short 6 month warranty period :(