Samsung UN60ES7500FXZA - Manual (Page 149)

Internet status.
When the wireless network connection
failed...
●
Wireless network connection failed.
No wireless router selected. Go to
Network Settings to select your router.
●
Unable to connect to wireless router.
Try the following: check that the router
is turned on, and if it is try turning it
off and on again. Check if you need to
enter a security key to use the router.