Connect the 'HDMI to TV' port on the cable box to the HDMI port on your TV. You can use the HDMI cable that came with the box, or any other HDMI cable. Make note of the HDMI port that you use on your TV so that you can easily switch to it later. • Many Comcast cable boxes have multiple HDMI ports. Make sure you're using the HDMI Out port on the box and not the HDMI Input ports. • If you don't have an HDMI port on your TV, you can use a coax cable to connect the 'To TV/RF Out' port to your TV's coax port. This will not result in high definition image. Connect any additional digital adapters. If you have multiple TVs and have active coax outlets, you can use digital adapters to connect your cable to additional TVs. Each adapter will need its own coax wall outlet. • Connecting a digital adapter is pretty much the same as a regular cable box. Use a coax cable to attach it to the wall outlet, and HDMI or coax cable to connect the adapter to the TV, and then connect the power adapter. • Make sure all of your digital adapters are connected and powered on before starting the activation process. Activate using the on-screen menu (X1 only in select markets). If you're using a newer X1 box and you are in a market that supports it, you may be able to activate using the on-screen menu: • Make sure the TV is set to the X1's input. You should see the X1 startup screen. • Select your language and wait while the X1 starts up. The initial startup time may take a while to complete, and the X1 may have to download updates. • Enter the information required to verify your account. This may be your whole phone number, the last four digits, or the account number. • Select a name for your X1 box and then wait while it activates. This may take another 20 minutes or so to complete. Avoid purchasing used cable boxes. All Comcast cable boxes are property of Comcast, and none are authorized for sale by other people. ![]() To activate your Internet connection with Comcast XFINITY’s self. How do I activate my Internet service with Comcast XFINITY? Visit Comcast.com/activate. My setup is Motorola Arris Surfboard SB6141 cable modem connected to a Cisco Linksys e2500 router which is connected to a desktop computer. I then have a laptop and mutiple iOS devices connecting over WiFi. Everything was working fine and then. I installed a new cable modem (the SB6141) so I. If you purchased a cable box from eBay, Craigslist, or any other re-seller, Comcast will not activate it because it is actually an un-returned rental. You should only get cable boxes directly from Comcast for new service, replacements, or additions. • Don't believe any listing or review claiming to have Comcast TV cable boxes for sale. They will not activate, and are most likely stolen. Get the most out of your Internet or Voice service by finding the right equipment To ensure you are taking full advantage of your Xfinity High-Speed Internet plan and to avoid service interruptions, you will need a network gateway capable of DOCSIS 3.0 or higher. This site provides a list of Xfinity approved devices available for purchase. To view a complete listing of all the approved gateways & modems that are compatible with your Xfinity High-Speed Internet plan, please visit our website. Compatible retail equipment.
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