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Go into the bios and check to make sure the usb ports are enabled if that is an option. Reboot the computer and notice the screen to see which key it says to hit to get into the Bios or System Setup. Hit the key and look through the bios for settings that affect the USB ports.
If you computer recognized the devices in the past it should recognize them now unless the drivers are messed up or missing, or the ports have gone bad.
If you are using usb devices that you have not used before on the computer then try one of your old usb devices that you have used before on the computer. It could be that the new usb devices are too advanced for the system. Some old systems for example can't read or detect a 1TB usb external drive.
If the usb device came with drivers, install the drivers.
There are no dummy ports on laptops....could be a cold solder point on the motherboard connections or a wire connection is loose. There is also the possibility that the usb controller for that port has failed. Below is the link to the service and repair manual for that laptop......
There are a few toys and devices made in China that deadshort the USB terminals. I hope you have not bought and installed one of these. I had 2 in the shop a year ago with some Dora Explorer usb toy that toasted the usb once installed. If you have bought and installed something about the same time as the usb stopped working you will need to call the company that made the device and demand they replace your motherboard.
As you have already stated that the port in question can run a standard optical mouse, the port seems to be working fine.
Sometimes the drivers for a USB device need to be installed for each USB port. Maybe you have installed these drivers for 3 of your 4 USB ports, but not for the one in question, result of which is the problem you face.