For many reasons, I want to dual-boot Lion and Snow Leopard (10.6.8+) on my late-2011 MacBook Pro. I, eh, borrowed a friend's Snow Leo install disc, burned it to an 8GB pen drive, plugged it in, booted, and... Apple logo, plus three beeps. I looked it up and it was something about no good banks... nonetheless, Lion works fine, so this must be caused by something else. I looked up installing SL on a machine that shipped with Lion, and all I've found is that you can install it by using a Firewire cable plus another Mac (that didn't ship with lion... something I don't have access to, but I may try it via my hackintosh.) But there must be another way. I refuse to believe that the hardware itself prevents me from running Snow Leopard except via a Firewire target-disk install. It just sounds a bit absurd. Anyone have any idea on how to do this? Thanks.