HDCP chip maybe, it's the HDMI nightmare.
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Agree it is just an early chip in the 2910 giving you problems.
I own a 5910 and i have trouble sometimes. I have to turn it off and back on a few times to have it lock in HDMI.
Also, try a different HDMI cable.
Then, on thhe other side, it may be your TV is just not programmed to accept the early HDMI style signal.
? Planned obsolescence?