This is a stretch but did you reboot the Tivo to see if that restores HDMI functionality?
Can you connect a RBG Component Video cable from the Roamio to a TV and see if you get a picture (and R/W audio for that matter).
If it's truly dead, did you happen to buy the Roamio with a good credit card with the feature that automatically adds one year to the factory warranty?
Premiere 2TB, Series3 OLED w/500GB, TWC Cisco 8742HDC DVR, Panasonic TC-P55ST60, URC MX-890 Remote, Onkyo TX-SR333 AVR
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