USB ports not working

[Pat]

My comp. has 4 USB ports (factory installed). Two of
the ports are not working (with any devices). Same
devices attached to either of the 2 working ports work
fine. (A device that works on a functioning port doesn't
work on a 'problem' port.)
BIOS is current & a check in Sys Utilities shows USB
"enabled". Troubleshooting doesn't show anything. Dev.
Mgr shows 2 USB Controllers & 2 Hubs. Each hub has 2
ports (1 with a functioning device; 1 avail.).
Any input in what is wrong & how to fix this will be
VERY appreciated!
Pat

 

[Jim Eshelman]

My comp. has 4 USB ports (factory installed). Two of
the ports are not working (with any devices). Same
devices attached to either of the 2 working ports work
fine. (A device that works on a functioning port doesn't
work on a 'problem' port.)
BIOS is current & a check in Sys Utilities shows USB
"enabled". Troubleshooting doesn't show anything. Dev.
Mgr shows 2 USB Controllers & 2 Hubs. Each hub has 2
ports (1 with a functioning device; 1 avail.).
Any input in what is wrong & how to fix this will be
VERY appreciated!

General USB Troubleshooting in Windows XP
http://support.microsoft.com/?kbid=310575

Other (more specific) USB troubleshooting articles are at
http://aumha.org/win5/kbhrdwar.htm under "USB."

--
Jim Eshelman, MS-MVP Windows
Windows Support Center: http://aumha.org/
Fighting Parasites: http://aumha.org/a/parasite.htm
Computer Health: http://aumha.org/a/health.htm
Troubleshooting: http://aumha.org/a/tshoot.htm