Hi there and welcome
Can you see the wifi network at all still?
Can you disconnect the TP link from the power, wait 5 minutes, connect it, wait 5 minutes for it to start and tell me what happens when you then try to connect to it please.
ok, on the unit is a reset button which returns it to new, Directly press and hold the reset button on the rear panel with a solid pin for approximately 1 to 2 seconds when the device is powered on. If you can see all the lights flashing, then go off and some lights go back on slowly, that means the device has been reset successfully.
Then set it up again and once setup, tell me if it now functions please.
you cannot connect to the actual wireless network?
And on what device is this eg: windows 7 computer?
ok, but what exactly happens when you try to connect to it?
It is the internal mainboard in the unit that has faulted.
I am really sorry about this and you are going to have to return the TP link to have it replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the page, then submit, that would be greatly appreciated.
you're most welcome
Let me know if you need anything else and please remember the service rating via one of the stars at the top of the screen then submit so I am credited