I'm working on a Dell XPS which is about 4 years old. Out of the blue, the 8 on board (6 back / 2 front) USB ports stopped working. They provide power to devices that charge, but no functionality - for example a USB flash drive never lights up / works but my USB bluetooth headset charges.
I've tried all of the usual fixes including removing/reinstalling the USB root hub in the device manager, flashing the BIOS, reinstalling the chipset drivers, checking IRQ steering, etc. Nothing. The computer does have a 4 port USB internal PCI card that does fully work, but I'd like to get the on board ports to work.
At this point I feel like it's highly likely these ports are in some way damaged from a hardware perspective, but I thought if anyone had some insight on troubleshooting when ports are providing power, but no functionality.