I prep a flash drive with the dmg as I've done in the past...it mounts just fine and the resulting window opens, but when I click install OS X I get the following message: "You cannot use the application "Install Mac OS X" with this version of Mac OS X." Am I missing something? This system sucks, but it meets the minimum requirements... (...and for anyone wondering, no it doesn't read DL-DVD's.) Thanks for your help. P.S. I've also tried just booting to the flash drive, but it isn't listed when I hold down the option key.