HOW TO: Setup your Mac Pro to run OSX, Linux, Windows Vista and windows XP
In this article, I will try to describe the main steps required to install 4 different OS (Mac OS X, Linux, Microsoft Vista et Microsoft 
Windows XP) on a Mac Pro. We have decided to avoid providing a step-by-step procedure to prevent beginners to try it out, considering the procedure as piece of cake, whereas it requires serious knowledge. If some steps remain unclear, please browse the internet to get info, or discuss about it in the dedicated topic in our forum. As usual, neither me or macbidouille/hardmac, are responsible for any damages or problem arising on your computer while you were trying to repeat the procedure. However, if you have comments or found an easier way to perform some steps or operations do not hesitate to post them in our dedicated forum
Problems to be solved
Hereafter is a list of problems that I had to solve or were arising while I was performing the installation
* • Using BootCamp or a GPT partition schema make everything more complicated. It is easier to avoid using them to my point of view.
* • Vista can not be installed on some HDs such as the Western Digital WD2500JS-41SGB0, due to a non-supported controller.
* • A bootable LiveCD Linux is not available yet for the Mac Pro (problem with the optical drive chipset driver).
* • Vista RC1 x86_32 and XP x86_32 does not support more than 2GB of RAM among the 6GB installed on my computer (no problem with Vista RC2 x86_64).
* • Vista and XP crash during the shunt down procedure (blue windows and usually an error wd.sys).
* • While booting from Linux or Vista, the Mac can hang on for up to 5 minutes (black screen after the bootloader, or temporary freeze during the boot procedure). One only needs to be patient.
* • Depending on the OS, the HD id can change, even for 2 identical sessions of the same OS, so one needs to be very cautious before launching a command line targeting the HD.
* • While using LiveCD Linux environment, in ISOLinux, or GRUB, I have lost the USB connection to my keyboard, so one will need to have it directly plug into a computer USB, no USB hub possible. Hardmac.com : Le “Macbidouille” in English