Hello, I have an imac G5 power pc chip and I recently performed an OS X software update as prompted by my mac - something went wrong during the update and I was told in a box that some folders were put in trash. I re-tried and the same happened. Now when I come to turn on my mac, I get a box with the OS X logo but the progress line makes no progress and OSX doesn't load. Must admit, I have misplaced the original OS X disc to restore with (it runs 10.4 tiger), but I may have access to one, though a bit worried that I may lose what's on my hard drive. Is there a better way forwards? Any suggestions please?