That usually happens when you've selected the wrong HDMI input on your TV, or that the HDMI cable has come loose from either the TV or Tivo box.
Check your cable is still attached, also check which HDMI port it's connected to on the TV and then use the TV remote to cycle through the HDMI options. It's usually called the Source button on most TV remotes, or it may a symbol like the one in the screenshot below.
You also might need to remove the HDMI cable from both devices and plug it in again, and then reboot both devices.
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Sorry to hear about the issue with your TV, have you now been able to fix this after the above advice from the very helpful newapollo?
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