Hello all, i have a MB that has Leopard pre-installed and now i HAVE TO install tiger to run some applications as Leopard still doesn't support it. Somehow after i put in the Tiger installation disc (10.4.10 that came with my iMac), there was an alert pop up and said "the software cannot be installed on this hard drive." I have already partitioned the Hard Disk and not sure what is the issue... is it the GUID format that i read about somewhere? or is there some kind of restriction ? and is it recommended not to install OS on a second partitioned drive? Please... could anyone help? Thanks!!