|Hi everyone! I need some help figuring out |
what's going on with USB ports not working. I
hope I provide enough information.
OK, so the computer is a Dell XPS, couple
years old. The USB ports are not working.
Bios does not recognize that a keyboard is
plugged in - unable to enter Bios. Laser mice
do not light up when plugged in.
I added a USB PCI card. This too does not
work. Still no light on laser mouse. I'm pretty
I tested the PSU. -5 tests bad. I know that
USB supplies 5v - so I order a replacement
Dell PSU. The -5 on the new PSU also tests
bad. USB ports still do not work with the new
I've ran into this same scenario before and am
trying to learn what's going on. My view now
is that the motherboard could be bad. But
before buying a new motherboard, I am asking
for some help/insight. Is it common for power
supplies to have -5 test bad? Is this an actual
problem with the psu or is it the tester
misreading? Why would the PCI USB card
not work as well?
Thanks for any help!