getting black screen after startup

I just downloaded Apple TV yesterday and twice I've gotten an error that says something like "Apple TV must restart".  Then it restarts, seems to  get stuck on the apple icon a bit, and then it plays the apple tv logo video that streams colors and ends with an image of the apple tv, then it goes to black and the menu never pops up.  AFter a few minutes, the screen saver starts and that works fine, but again when I hit a button on the remote, it goes to black again.  When it happened yesterday, I reinstalled everything and things were working again, but I don't want to have to reinstall and set everything up a third time.  Any suggestions?

Thank you.

I followed the suggestion in this other thread (using Cyberduck to trash mount preferences) and it worked: