Compaq Deskpro EN Pentium III 733, 265MB RAM Windows XP Pro SP2 with Updates and hotfixes.
Connect USB drive to USB port on Compaq. Makes connection sound and the appropriate icon appears in the System Tray however NO drive letter is assigned. Device Manager also shows connection pulling 200mA.
Logged on as Administrator. Disk Management shows the drive without a drive letter and a drive letter can be assigned but nothing shows up in Windows Explorer. Right click on the USB device in Disk Management and click Explore, nothing. Left click the OPEN option and you can browse the drive (but there is still no drive letter appearing in Explorer even though one has been manually assigned). This is NOT a drive mapping problem and no GPO has been applied either. USB worked fine when Windows 98 was installed (with USB drivers of course).
Chipset drivers were installed (or attempted) but was stopped at 45% due to XP supporting the chipset. Damaged USB devices have also been eliminated from this problem.
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