Of late i have begun having problems with my power book, so much infact i decided to copy off all my work and reinstall this has lead to the largest problem of all, It wont let me!!!! i have tried to reboot with the systme disc in and it goes straight to login, and when i just put the disc in it says I have inserted a disc with a volume that OSX cant read. is this a problem with my disc drive or a more serious issue with my system??? I thought reinstall would clear it all but i cant even do that.... any ideas?