I've just bought an HMP5000. It doesn't appear at all on the source list for my TV. I'm not even sure if it's on or not because I can't see any power light, or any other indication that it's working. I've tried connecting it with an HDMI cable, and with regular AV cables. I've tried it with a Flashdrive in the USB slot. At no stage has there been any sign of the TV recognising it.

What do I do next?