This is an issue I used to see all the time when I used serial on a semi-permanent basis (now I use my network card and a telnet program called PuTTY instead).
Anyway, try this: Reboot the TiVo and let it boot up to the main menu (TiVo central). DO NOT go into watching live TV. Leave it on the main menu.
Then see if you get response. If not try going up to 19200 baud and type some characters. If you get a clear response then continue at 19200 but if you get garbled text drop back to 9600 and see what happens.
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