Fuse for the mouse and keyboard has long been obsoleted by a
resetable fuse ("polycrystalline rresettable fuses") even back when
processors were in the 200 and 400 Mhz range. Only motherboard in
that era I even saw still using a fuse was a Packard Bell. Even 15
years ago, Michigan Component (MCI) was violating Raychem's patent to
make resetable fuses - the technology being that old.

Second, USB port is suppose to current limit current to 100 ma.
Again, a design requirement that would be missing to blow a fuse.
Both problems (design defects) must exist to have what appears to have
happened: a blown fuse disconnects five volts to USB ports, mouse, and
keyboard.

Fusing current for a 30 AWG wire is about 10 amps. Too high. Worse
case, wire may even create a fire hazard. If fuse is blown, get the
Raychem (now called Tyco) part from any electronic part house or get
fuse with lead wires. Do not use the 30 AWG wire suggestion.

On Jan 29, 10:40 pm, Hugh Prescott wrote:
Your motherboard may just have one fuse for all. Find an old keyboard
and salvage the fuses from it and replace the fuses on the blown
motherboard.

Some / many newer high end motherboards have polycrystalline rresettable
fuses they look like two metal plates with some epoxy between them
usually colored green. If you have these and they have the top plate
blown off or deformed or are blackened you need to find replacements and
install them. DigiKey is a good source.

Or just redneck it and install #30 wire wrap wire jumpers, will blow at
about 5 amps.