So I bought an iMac G5 off eBay the other day, and apparently they lost the Install discs that came with it, and thus bought a 2nd hand retail Tiger Install Disc package to sell with the iMac. It's the black box one, but as I've mentioned previously, when being prompted to restart, I mean after said restart, it just stays on the grey screen with the Apple logo and the machine begins to make very loud sounds, this lasts up to 10 minutes before I decide to turn it off. So I'm thinking maybe my disc is corrupt or broken, or it's the wrong install disc version for my Mac. Here are the specifications. iMac G5 17" screen with iSight PowerMac12,1 PowerPC G5 (3.1) 1.9GHz 512MB Does anyone know which Tiger Install disc version comes with or is needed for this version iMac? Or alternatively, if I purchased Leopard, would that work on my iMac? Thanks.