I am not really experienced with Macs, kinda noobish. How do you install Linux like Ubuntu on a Mac? Is the gray disk selection screen hard coded into Macs or are they brought forward by Mac OSX? About formatting: On a PC, if I bring a raw hard drive or totally wipe one, and the system finds no boot disk, it gives a boot error which is hard coded into the motherboard. Is the gray disk screen also hard coded similarly on a Mac? If I wipe out an OEM install of Windows, and try to install using the recovery disks, it doesnt install properly because of licensing crap. But if I use a retail copy on a total wipe out disk, it works. So what do Macs do in this case? Can I get a raw 3rd party drive, plug it into my Mac (Mac Pro???) as a primary drive and expect Mac OSX to install like normal?