Been working fine until got new wifi smart tv, gave option to press WPS button and did. Now internet not working. Only the green power light is on and the green WLAN light is flashing.

Hello ,
You can easily connect you new Tv to internet using few steps.
Press Home button on your TV remote.
Select network.
Select network as the network type.
Select network setup.
Choose select a network.
Select your network name.
Enter the wifi password, and press the Blue button on your samsung remote.
your samsung smart tv will attempt to connect to your in Home wifi.
Follow these steps and solved your problem.

https://www.downloads.netgear.com/files/GDC/EX6110/EX6110_QSG_EN.pdf
Hello, this link you can find all your answers they explein step for step.

Usually you select the wifi network, tap Connect and then you're prompted for the password. I've never tried it, but if you pressed WPS on the router just before tapping Connect, maybe WPS would work.

no, that option is not avaliable

Blue?
the n300 colors.....
4 LED Descriptions
Router Link LED
This LED indicates the connection between the extender and the router or access point.
Solid green
. Best connection.
Solid ambe
r. Good connection.
Solid red
. Poor connection.
Off
. No connection.
Device Link LED
This LED indicates the connection between the extender and a computer or mobile device.
Solid green
. Best connection.
Solid amber
. Good connection.
Solid red
. Poor connection.
Off
. No connection.

Power LED
Solid amber
. The extender is booting.
Solid green
. The extender is powered on.
Off
. The extender is powered off.
WPS LED
Solid green
. WiFi security is enabled (WPA or WPA2).
Blinking green
. A WPS connection is being established.
Off
. WiFi security is not enabled.
Note:
If the Router Link LED or Device Link LED is amber or red, Find the Best Location

TRY the WPS button on the router, considering you have a wireless router. Write down the Key code listed on the WiFi Router as it may need to be used to connect your TV with the WiFi system. If your TV is NOT a Smart TV, you will need a USB WiFi receiver to attach to the TV. New Smart TVs have a built in receiver.

WPS=WiFi Protected Setup. This is typically used to connect a Wireless Router to a Wireless Repeater. Both must be WPS capable and using WPS is similar to pairing two Bluetooth devices. One device transmits WPS and another listens (after you initiate a WPS sync). You have to enter a WPS PIN and the devices should connect.

The wireless and WPS lights solid green mean that the wifi and WPS are active. It also means that your home network is exposed to anyone with a laptop/pad/smart phone who knows how to hack into systems that have not been set up properly with the proper security.
I see the following security issues with your router:
1. The router's password is still the default or it does not have one.
(This means anyone who knows your router maker and model can easily break into your network and systems and steal your info, the router maker is broadcast by your wifi SSID, so they know it)
2. WPS is enabled and active (WifiProtectedSetup)(this service is a major security hole that is used by hackers to gain access to routers, it must be disabled for protection)
3. The wireless (wifi) connections are open (not encrypted), anyone can intercept the wireless traffic and read it. WPA2/AES encryption needs to be configured for the best protection.
4. The router's built in firewall may not be configured correctly exposing you to drive-by hacking.
To resolve these issues requires someone who understands router security and is best done onsite.
You need to engage someone you trust to check and configure your router and computer systems properly to protect yourself.

WPS only works with client Wi-Fi devices that have a WPS button.
Your router does not have it, so it does not work.