A couple of questions for you.
If you force a daily call via tivoweb and pick up the phone, can you hear your Tivo dialling and initiating a connection with your ISP?
If it doesn't and you haven't changed anything, there is a possibility your TiVos internal modem has decided to stop working. There are instructions on Minnie on how to use an external modem via the TiVo's serial port.
Regarding the network connecting, how is your tivo connected to your PC?
What image are you using?
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