Do you have a router which can share internet access? One PA4030 is connected to the router, right?
Only a specific port works or any port works if only one device is connected?
When there are more than one PC connected to another PA4030, on the PC without internet access, what's the status of local area connection? Any IP address obtained?

M Diamond wrote

Do you have a router which can share internet access? One PA4030 is connected to the router, right?
Only a specific port works or any port works if only one device is connected?
When there are more than one PC connected to another PA4030, on the PC without internet access, what's the status of local area connection? Any IP address obtained?

Hi, thanks for coming back to me. I sorted the problem in the end and it was my stupidity that was the cause... The device I was connecting to (a Yamaha AV amp) had a fixed IP address that I had set up for my old router. With the new router I now have connected to my TP Link kit, it required a new IP address. Changed that on the Yamaha and everything now works!

Thanks anyway...

Brilliant! :)