I currrently run osx 10.4 on a powerbook, but the DVD drive isnt recognised when I install a disc. This is only a recent problem but prior 2 years were fine. Can I copy the installation discs onto an exteranl hard drive , formatted in fat32, and then install from the hard drive onto the mac. I want to take the operrting system back to the original installation as I am trying to get my dvd drive to work. I dont want to be running 2 versions of tiger.