Thank you all very much for your help. I's most appreciated.
Although I've been building my own computers from scratch for fifteen years, I've never needed WIFI so it's all new, and confusing, to me.
I should state at this point that I only want to watch whats on the computer on the TV, and not operate the computer from the TV.
Below is a snip from the manual of the Telstra T-Gateway that I have.
T-Gateway snip.JPG
As per the set-up instructions my phone is connected to the far left green port, my computer is connected to the GbE port next to the red WAN port and the red WAN port to the NBN box on my wall.
The snip shows a further connection from #1 Ethernet port to a PC, and I was wondering if I could use that to connect my computer to the T-Gateway using one of these USB 3.0 to Gigabit RJ45 Ethernet LAN Network Adapter 1000Mbps For PC ....http://www.ebay.com.au/itm/USB-3-0-t...AAAOSwI-BWF4iT and then use the T-Gateway to send the signal to my TV.
Probably another dumb question so apologies in advance.