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If your TV and the Apple TV won't pickup your Wi Fi - then you have a problem with your wi fi. The TV and Apple TV box are separate devices, so you didn't have two devices fail at the same time....you have an issue with the internet connection that feeds them both.
So that said, how far from the TV and Apple TV is the router? What router do you have (brand and model ) and also how many other devices are connected to the router? Do the TV and Apple TV detect the router as an available connection?
Please reply back to the rest...
Let me try again. How far is the router from the TV. Have you tried connecting the Apple TV box and does the Apple TV box detect the router? Please reply back with as much detail as possible.