Our latest trial was xp pro sp3 loaded unto drive using fat32 formatted drive- it booted all the way mup.sys file and then did a reboot. That is the closest we got about 40 files to load/run until it glitched. So we suspect a bios hack or defective bios. The newest version of bios to flash it from hp oem bios update requires you to be in windows and not from boot bios- we downloaded direct from the site. We can access bios, we just can't flash update it. I think our solution is to look for a different unit - do you have one for sale? Back to ebay.
TC1000 tc1100 tc4200 and now a tc4400