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My first reaction is that you need to contact the cable company.
Please give a complete description of the setup---eg I'm guessing that there is a cable modem to get the internet connection. I'd also assume that the local connections to this would default to DHCP (as opposed to a fixed IP address).
Is the the TV part working correctly?
Can you ping the modem? Typically 192.168.1.1, but also sometimes 10.0.0.1 or something similar. Assuming that you can ping the modem, see if you can get to the admin page (simply enter the IP into your browser.)
I agree with michaelk. I suspect that the tech did not properly "provision" (fancy industry term for "set up") the account with the modem information, which includes the modem MAC address and related data.
You should be able to connect your computer directly to the modem with an ethernet cable and get a connection with a DHCP address supplied from the cable company. If you cannot connect in that manner, the issue is either the modem itself, the wiring, or the provisioning of the account.