How do I fix my frontal USB ports?

For some reason, things I connect to the USB ports located on the front of my PC are not recognised by the system. I try refresh, add new hardware, etc…nothing happens. Funnilly enough the light on flash drives or external HDDs that I connect works, which means that at least the device gets power and the port is working.

If I connect the same device to one of my 4 ports in the back, it works fine.

Both frontal ports worked fine until a couple of weeks ago, and I haven’t changed anything on my computer.

I have tried reinstalling drivers, disabling and re-enabling the device etc, nothing happens. Everything seems to be working fine, at least in theory. It looks as if it’s the flash/HDD that has the problem, but as I said they work fine in the back ports, so that’s not it either.

Any other ideas?