I've had many instances of HDMI simply dropping out and losing connection. It seems to come and go for no reason.
Make sure that your desktop resolution matches the native pixel resolution of the TV - e.g. 1920x1080, 1280x720, etc.
Also, unplug and re-plug each end of the cable to make sure you are getting a solid connection. Unplug/plug helps to wipe any dirt and/or corrosion off the contacts.
Btw, the only advantage to HDMI over DVI is that DVI would require a separate audio cable. If you have the provision for a computer audio input, feel free to use the DVI (or even VGA) connection if it works as well (video-wise).
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