I've got a Power Tower Pro and I'd like to be able to run a newer operating system on it, however currently I can't get anything newer than OS 8 to boot. I've tried 8.5 8.6 and 9.1 and it just ignores the install media, but as soon as I put in the OS 8 disc it boots perfect. They are all retail discs, is there some special trick to getting it to recognize something newer? I have memory maxed out at 1GB and a XLR8 G3 card in it and it is working just fine with that setup on OS 8. I'd really like to bump it up to something newer but I'm stuck on this. Any tips? Thanks!