usb drive not detected in explorer but seen in disc management

Trying to locate my answer with google search ... thought maybe the forum here could direct me quicker to the results I need .. The front of panel of my Motherboard N68C-GS FX .. has two usb 2.0 drives i nfront and 4 in the rear .. the front left drive usb port does not get seen or recognised in explorer ... but is seen when I go thru disc management instead ... If a drive that is supported with USB cable i nthe rear is een but whne connected to the front it does not ..

must be something turned off ......

advise?

 

http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-bph05956

troubleshoot usb on an HP

http://www.asrock.com/mb/NVIDIA/N68C-GS FX/?cat=Download&os=XP

above link has a usb utility to check usb on this motherboard

https://www.google.com/#q=rear+usb+detected,+front+usb+not+seen,+xp&srblb=1

above is a google search page

for better assistance please tell me the make, model and model number of pc

are you fully updated??

clear of infections??

did they used to work??/

have you done a system restore, and/or restarted pc, sometimes a restart will clear the issue.

any yellow warnings in device manager??