trouble installing snow leopard My optical drive is no longer working and I'm having trouble updating from leopard to snow leopard I got this message when I tried to install 


  "To install Mac OS X, use Disk utility to burn this disk image to a DVD and run this application again"


I've tried using disc utility to copy an image of the disk and mounting and to try to trick my mac to thinking its a disk, then tried rebooting the mac while holding down the option button but nothing but the hard drive comes up.

Does anybody else have any suggestions? 

Is there some kind of command that can make my computer recognize it as a disk? 

I have also tried using remote disk from my sisters macbook pro to install the software that had already had a disk image copied &amp; burned to a disk.
You need to restore Snow Leopard image in Disk Utility to GUID partitioned drive or flash stick. Only after that it will be possible to boot from it.