Hi Rick,
By default, Ethernet adapter always starts before system starts. That’s why we can use PXE boot to install system.
So for your question, please go to Device Manager -> Network adapters, find out the
Ethernet adapter, right-click it and select Properties, Power Management tab, make sure Allow the computer to turn off this device to save power option is untick.
Then, turn off Windows 10 fast startup.
Check your BIOS settings.
Similar case here:
https://www.overclockers.com/forums/showthread.php/782479-Integrated-Network-Adapter-will-not-start-on-cold-startup
Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Regards
Please remember to mark the replies as answers if they help.
If you have feedback for TechNet Subscriber Support, contact
tnmff@microsoft.com.