I am working with a large quantity of both these model desktops. As part of the agreement with the original owner we had to shred the hard drives and are supposed to remove all asset and service tags. I have svctag.exe version 3.2 and version A28 and neither of these seem to work on this model. In fact these model desktops are the only ones I have come across that do not work with these disk. I already tried the cmos jumper and left the power unplugged and the battery out for a few days and this did not work. Anyone have any other suggestions?