Just to restate the obvious, I would try the holy grail--it seems, anyway--of power cord reset, hard reboot, and smart card reseat before you start worrying about anything serious. Also there is a diagnostic screen to check hard drive temperatures in the menu should you be able to get to it. I mention this only because I've read that much like their desktop counterparts intensive heat will force the system to shut down and not immediately power back up.
I have the same model and when mine started acting up, I had to call DISH for a replacement because of a hard drive failure--at least, that's what the guy in the spiffy rig told me during the service call and who am I to doubt him? I didn't get any picture at all, however, so maybe yours is something completely unrelated.
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