Reformatting and updating to Tiger trouble:restart and try again

[pamatt]

I had Panther on my g3 900mhz ibook and was in the process of upgrading from Panther to Tiger. I had the 4 CD's and began installation. It checked the disc, made it through the majority of the first disc and then the screen comes up as restart and try again. I borrowed a friends dvd's and it did the same thing. I don't know what else to try. I've searched around for people with this same problem, but have come up empty handed. I'm open to any potential solution...