Hi
Start the pc, as its booting you should see a message like this " press
delete to enter bios " ( something's it's not the delete key ? sometimes
its called setup menu ? ).
Press the correct key delete or ? b4 the message disappears ( if you are to
late a miss it just reboot ..it may go by fast).
Scroll around and see if anything relating to usb is disable ( make notes on
anything you change don't go hog while and make to many changes at once,
make a few and see what happens go back again and make more if need be. ).
If something go wrong look in you motherboard instructions and there should
be a jumper that will restore default settings. ( something's can't stop
your pc from booting at all , like cpu, memory, and video settings ). You
can also remove the battery to restore to default bios settings, just be
careful to restore it correctly. If you make changes and the return back to
default the next day or so then you may need a new battery ( not holding a
charge ).