My school is getting in a shipment of iMacs this coming Monday. The media specialist would prefer that all of these would be rolled back to Tiger so that the entire library has the same operating system. We've been doing the OS 9.2/10.2/10.4 shuffle for years, and Tiger is as high as our iBooks will go, so we would like to standardize on Tiger for all of our machines if at all possible. We asked our Apple Rep if it would be possible to do this with the August 2007 revision, which is what we ordered, and he replied that we wouldn't. However, we have an August 2007 iMac already here that came preloaded with Leopard that we were able to roll back. Because they are of the same revision, did the rep not know what he was talking about and give us incorrect information, or is it actually impossible to do this? Thanks for any help.