No internet connection on start up. "TROUBLE SHOOTING" always fixes the same problem:Local area connection has "NO VALID IP ADDRESS" I have an IP v4 address but no IPv6 address. Is this important? I have not got a clue.

You are using router? Try update the firm ware for the router.

Hi, Thank you for posting. Please remove the NIC driver, reboot the computer and reinstall the NIC driver and see how it works. If it is possible, you can also update the NIC driver. Additionally, please let us know the brand and model of the NIC. If the issue persists, please run ipconfig /all in an elevated command prompt and post the results to this thread for our further research. Hope this helps. Thanks.Nicholas Li - MSFT