Two weeks and three installation discs later, Tiger still will not install onto either of my hard drives. The latest install disc Apple shipped at their convenience taking 9 days to arrive. "BomFatalError - cpio read error: bad file format" is the error I see in the installer log. Same error every time, though not always occurring in the same place. I had no problems whatsoever running 10.3.9. I have verified, verified, verified, and reverified permissions and repairs on both hard drives. I have allowed the installer to check the DVD every time without skipping. I have removed third party ram. I have disconnected all peripherals except the screen, the keyboard, and the mouse. I have done everything from update to archive & install to erase & install. I have even tried installing from my ipod. AppleCare is completely useless, not to mention slow. They have no answers for this and just want to offer me another DVD to try (taking over a week to ship again) and a t-shirt to appease me. I have 2 days left to get a refund from the store I bought it at. So if anyone has any ideas as to what this error is or how to get around it, please let me know.