Mark wants to know if he can check out Linux on his iMac. Leo says in theory, yes. But Leo's experience is that they don't really work hand in hand well. Do some research online to see which version of Linux works best on a Mac. Then put that version on a USB key, then boot the mac holding down the command key. That'll give you a list of drives to access, and then you can run Linux on the USB key to see if it works.