I'm sorry to hear that you're having trouble with your new TV.
To reset the TV, turn it on, and press and hold(!) the EXIT button for 15 seconds. It may prompt you to RESET? (and then choose YES and [ENTER]).
After that, restarting your television should take you through the initial settings as if you took the TV out of the box.
As for the dongle, you may need to contact the Samsung customer service center in your region for setup instructions and troubleshooting your network.
Hi, Just purchased the above Tv and I feel I may have done initial setup run.. Is there anyway I can reset the tv back to how it was when it came in the box??? I feel i have done it wrong as certain 'menu' items are not available to me(cant set time etc).....also I purchased a Samsung Lan adaptor but the tv doesnt know its there, but it does know when i stick a usb in to watch media? Any help please...im a techno dunce.:)