Have you tried the USB device on a different system? You could also try using an analog connection instead of digital. Everything so far I'm afraid is indicating a rare hardware failure with the unit. The first hint that something is working should be that the monitor goes out of standby (usually indicated by an amber light), you should also get the main screen blinking as Windows rearranges the outpouts.
It's just possible that there is no digitial output coming, out of the unit, but there may be an analog one (hence the suggestion).
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