Hi Guys, THe last company I worked for regularly ditched office PCs and gave them to us. I always kept the SATA drives and RAM, and took the rest of the PCs back, ad threw it in their bins. Now I got a USB SATA adapter and was able to boot straight to a Ubuntu install from one of the HDDs connected with USB. So it appears the Mac doesn't care what it runs, but will only help you install Windows 7 or 8. This Ubuntu install was done for another clone PC, so why not set up a Windows XP, or other unsupported op system that way, and always boot from the USB HDD? Cheers, Art.