Hey folks - I have a 5,1-era Mac Pro that I've relegated to server duty. It's currently running CentOS 7, and I'm trying like hell to replace that with FreeBSD 10.2. I'm not looking for help with that specifically; what I'm having a hell of a time with is getting the thing to boot from a USB thumb drive. I've got a bootable thumb drive that I created with my 2012 Retina Macbook Pro. When I reboot the Macbook and hold the Option key, the thumb drive is seen as bootable. And it loads right into the FreeBSD installer. However, when I attempt to do the same thing with the 5,1, no bueno. It just sits there for a while, and then finally shows me the existing bootable hard drive. The thumb drive is ignored. My gut is telling me it's because the OEM SmartDrive is long gone. And it is. I removed it ages ago and threw it into the trash where it belongs. But I think I've read here and elsewhere that the Mac Pro may be seeing that thumb drive as "Windows", and because the SmartDrive isn't there, it won't boot from it? I've reset SMC, I've reset the PRAM, I've removed all of the HDDs from the system... nothing works. I somehow managed to create a bootable thumb drive with CentOS a year or so ago, but I can't remember what I did or how I did it. I can't replicate that w/the FreeBSD installer. Any hints or guesses? Thanks.