Hi! @Jsun5761, Welcome to HP forums.
I understand you are trying to add com3 port on your PC but you are getting error code 34.
Don't worry I'll try to help you out.
Did you make any software or hardware changes on your PC?
Have you tried checking with different USB devices?
What is the device you are trying to add on your PC?
As you mentioned you are trying to add com3 port on your PC but you are getting error code 34.
Please provide the product number of your PC to assist you better.
Also, as you mentioned you did run a system diagnostics test it failed with a failure ID.
The device requires manual configuration. See the hardware documentation or contact the hardware vendor for instructions on manually configuring the device. After you configure the device itself, you can use the Resources tab in Device Manager to configure the resource settings in Windows.
To check for hidden devices.
1. Go to Device Manager
2. Click on View
3. Click Show hidden devices
4. Then expand all the items under Device Manager
5. There will be grayed out devices, uninstall all of those that are grayed out.
6. Restart the computer and then plug the external devices to the computer.
If this does not work, then make sure that the Com ports are enabled and set to 'auto' in the BIOS.
Please try the steps recommended below.
1. Open Device Manager.
2. Expand category “Universal Serial Bus controllers”.
3. Double-click the “USB Root Hub” device, and click the Power Management tab. (if there’s more than one USB Root Hub device, repeat these steps for each one.)
4. Turn off the Allow the computer to turn off this device to save power option, and click OK button.
Disconnect all USB devices connected to the computer except a USB mouse and keyboard (if in use). This includes hubs, thumb drives, printers, and cameras.
In Windows, search for and open Device Manager.
The Device Manager window opens.
Double-click Universal Serial Bus Controllers to expand the list.
Right-click the first USB Root Hub in the list, then select Uninstall.
Click OK to confirm.
Continue uninstalling all USB Root Hubs listed.
Close Device Manager and restart the computer.
If the USB device that is having problems came with software and it was not previously installed, install the software now, following the manufacturer instructions.
Reconnect the USB device that was having problems and test it to see if it works.
Open Device Manager (Right Click on Windows Logo and Click Device Manager).
Now find and expand Universal Serial Bus controllers. Now right click on USB drivers and click Uninstall. Do for all USB drivers one by one.
Now Restart your PC. The USB drivers are automatically re-install and solve the corrupted USB devices.
Right-click on the battery icon and click Power Options.
Click Change plan settings.
Now click Change advanced power settings.
Find and expand USB settings.
Expand USB selective suspend settings and Disable both On battery and Plugged in settings.
Refer this article to further troubleshoot USB connection issues with your PC.
Please contact HP support for service options.
Link to contact HP.
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