[dba-Tech] USB ports not working

Anyone having any idea why my USB ports would quit working? I have two
separate banks of USB ports. It started with one in one unit and then one in
the other unit. Then shortly after all of them quit working. Very
inconvenient as I use a USB KVM system and a lot of USB devices! I get just
a slight indication of power from some of them but no indication that
Windows knows the devices are plugged in.