|See system properties tab maybe to start. |
See event viewer logs also.
Could be if an add on card it needs to be reseated.
Could be some usb item took too much current and it shut down.
Might need to un-install usb root and re-install it. Be sure you have the drivers.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10