TiVo HD; The HDMI out is dead except during the welcome screen from powering up. Tried it on a HDTV & on a PC monitor. There is always power on the output as it lights up a external HDMI switch (switch is HDMI powered) on my PC monitor, but no video. Screen is black. I don't know why it is active at that 90 second welcome screen, then nothing. Almost as a PC would boot, showing the BIOS screen, then when the O/S loads, the screen goes black as in a driver problem. I tried all the format choices and still nothing on both monitors. I also tried a 2nd cable, but no difference. Component & composite are Ok during all phases. .