Have the PS3 "Scan" and list the Wireless Access Points in range, and choose the one connected to your Comcast account. This is the same as the Wireless Network to which your computer is connected. Verify that the name of Access point, called an SSID is correct.

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How to Connect PS3 to Wifi | PC-MIND

Unplug all network devices including the PS3 system. Wait a few minutes before turning them back on – this will refresh the network settings. Check your router manual — to connect with a PS3 system, your router must support 802.11b or 802.11g wireless protocols. If you are using an 802.11n router, it should be set to mixed mode.

How to Boost your PS3 Wifi signal « PlayStation 3

In order to connect to a wireless network, you must have the required credentials. These are: Wireless Network Name (SSID) Wireless Network Key (Password) Finding Network Credentials. Most wireless routers or gateways have a label with the default credentials. If the credentials aren't there, check the documentation that came with your device. Does the PS3 have Wi-Fi? Or needs a wire? | Yahoo Answers Jun 30, 2010 PS3 isn't reading wireless controllers or wifi : PS3