@njdevil673 Welcome to HP Community!
I understand that the wifi missing from a desktop computer.
Please refer to this HP Article for assistance in turning off airplane mode. (Article is titled notebook, but the procedure is the same for desktops/all-in-one.)
As long as the computer is in Airplane mode, none of the wireless networks will be listed on your computer.
If the issue persists even after following the procedure mentioned in the article.
Please follow the procedure mentioned below.
Open device manager by doing a right-click on the Windows button.
Please check if the wireless adapter is enabled in device manager (check if there are any errors)
Open network and sharing center by doing right-click on the network icon the taskbar.
On the network and sharing center screen, select the option on the left - change adapter settings.
This would display the network adapters on the computer.
Right-click on the wireless adapter and check if it is enabled and try to connect to your network.
For other troubleshooting steps, please refer to this HP Article.
Keep us posted,
If you would like to thank us for our efforts to help you,
Give us a virtual high-five by clicking the 'Thumbs Up' icon below, followed by clicking on the "Accept as solution" on this post,
Have a great day!