Hello, my power line adapters are quite old but they are still pretty good, but just recently they have completely lost the ability to pair together. I can use my pc without them but it is horribly slow. 

As far as troubleshooting goes i have tried the following

Using a new cable

resetting the adapters

re pairing them

putting them in the same room

leaving them off for a few hours

resetting them via the button and the software

pairing them through the tpPLC

swapping them around

putting them into different power points

What ever it is i cant get them to pair at all, i have not smashed or damaged them in anyway.

They also are both picked up by the software when they are plugged into pc, but don't work when i add them by the power line password thing.

Any suggestions or ideas would work, plus warranty details if they are broken.

Thanks in advance.