Had to change my WiFi extender a couple of days ago. To do this I had to shut down the main router for a short while. Since then my HP Envy 5540 simply refuses to connect to the network. I did a factory reset, I tried with a USB connection using my laptop. All to no avail. It does recognize the router but simply does not pair.

No idea what to do next.

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Spent another couple of hours reading manuals and trouble shooting sheets. Turns out that if your router is 5GHz you might have issues. Either to you switch to 2,4GHz or you need new drivers and reinstall it all. Since I did not change the router, I do not quite understand. However I have done as requested and it now works.