I connected my laptop to the tv and it has worked before. this time only the laptop flashes the blue screen and the tv is saying no signal. when i tried to check the dispaly arrangement it says this:The Arrangement tab of Displays preferences is hidden

i connected my laptop to the tv and it has worked before. this time only the laptop flashes the blue screen and the tv is saying no signal. when i tried to check the dispaly arrangement it says this:The Arrangement tab of Displays preferences is hidden because you only have a single display attached to this computer.

It is not properly connected to the network.
Make sure location is set correctly
DNS should be on auto (settings - general - network)
Try ethernet
Signal strength on device won't account for issues, you would need a network report from istumbler, netstumbler or similar. This will show accurate signal strength along with noise and nearby networks

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