My Dimension will not consistently communicate with my new APC Back-UPS ES.  The UPS connects via USB.  MY Dimension is running XP.

If I unplug the USB cable and then plug it back in, then the PC communicates just fine.

APC's website instructed me to 'Enable legacy USB' which was already enabled and to disable "advanced power management'.  Also to remove the device and reinstall.  Did all of those.  Still no luck.

Has anyone else encountered this problem?

Thanks,

Marc