I tried plugging the Flex box into a tv. I goes to the welcome screen but then cuts to black. The white light on the box is still on but nothign else works and nothing happens.
I've had the same issue since I first tried to set it up. Just doesn't work.
Nobody seems to have an answer for us.
Can you try pressing the WPS button on the bottom on the box? This should try and connect your device to a wifi signal. Are you using a comcast leased modem or do you own your modem?