Originally Posted by hannah9000
According to a serial number check, the Mac came with Mac OS X 10.4 Tiger when it was first built. The shop I bought it from have provided me with grey install discs Version 10.5 - 'For Mac Computers' they said these were the discs they used for the original install (which was leopard beta for some reason so I think they're fibbing).
I've got a Powermac G5 which had 10.5 on it, beta version, which didn't let me do anything hence the reformat...
Mac OS X 10.5 Leopard was released in 10/2007, the last PowerMac G5 was released in 10/2005, Mac OS X 10.4 Tiger was released in 4/2005, thus if you have a PowerMac G5 bought after April 2005 (not by you of course), it came with Tiger. Those grey DVDs for Leopard you have are beta versions obviously and the beta might have already expired (I don' know about Apple's beta policy). Don't you have the original grey Restore DVDs with Tiger on it? If not, you need to buy the RETAIL version of Mac OS X Leopard, there is no way around it and you have to spend the money. Or you can live with Mac OS X 10.4 Tiger and contact Apple about sending you replacement DVDs for that PowerMac, it should cost around 15 to 30 USD.