So I have the .DMG file and .ISO file of Lion OS X on my desktop as a backup. I've tried burning the ISO to a disc, so that I can do a complete fresh install on the mac. Every time I try to do this the process starts, then it says that the CD didn't respond and now it's unable to recover it. Is there another option I could try, perhaps putting the Lion files on a USB, would that work? Or could I use the files on the desktop to initiate the wipe and fresh install? Any advice is greatly appreciated, as I need to do this ASAP for a friend. Cheers.