His MacPro1,1 is working as Hackintosh and therefore Boot Camp does not work any more.
Or have you got it to work on a Hack?
I'll try to provide some information on the subject of Chameleon on Macs and Windows on Macs, this might be helpful to understand the problem you are facing.
The key difference between an Intel Mac and a PC is BIOS. Apple use EFI for Intel Macs, while most of older (and some new) computers have BIOS (legacy BIOS as it is called today). Hence OS X is designed to work with EFI firmware Apple provides on their computers. Windows (Vista and up) can work with both (U)EFI and legacy BIOS.
Apple has a legacy BIOS emulation build-in in to their EFI firmware. AFAIK it was done in order for the user be able to install other OSs on a Mac (be it Windows or Linux). Boot Camp tool helps you to shrink the existing disk (if there is only one disk in the computer) then creates a FAT partition (using the space gained after shrinking the existing OS X partition) and finally reboots your Mac in to legacy BIOS emulation mode so you could install Windows in non (U)EFI mode.
OS X (original not patched version) may only be installed on a GPT disk (Windows can only boot from GPT disk if (U)EFI is used - not the legacy BIOS), Boot Camp creates a hybrid disk (OS X recognise such a disk as a GPT disk, while Windows recognise such a disk as a MBR disk).
On a PC Chameleon is used to emulate Apple's EFI firmware (otherwise OS X won't even boot). Since older MacPros have 32-bit firmware while 64-bit is needed for newer OS X versions, Chameleon is used on these Macs to provide the 64-bit emulated firmware. That is the boot process goes like this:
- 32-bit EFI boot (as usual)
- enter legacy BIOS mode in order to be able to install and use Chameleon (Chameleon can only work in legacy BIOS mode not (U)EFI mode)
- boot to OS X (which is tricked (by Chameleon) in to thinking that it is working on 64-bit EFI Mac)