I broke out my old G4 800mhz iMac the other day and decided to upgrade it to Leopard from Tiger. Using Leopard Assist, I booted to the install DVD and ran through the process with no issues. Once the system booted up after the upgrade it boots to a blue screen and goes no further. I'm stuck now. Any advice would be much appreciated. Here are the things I've tried that have not worked: -Resetting the PRAM multiple times -Unplugging the power cable -Running Disk Repair/Permissions Repair from the Leopard install disc -Booting into safe mode (does not work, still stuck on blue screen) I would love to find a solution to this, but I may just have to go dig out my old Tiger discs and start from scratch. I just don't know why it would hang like this after the upgrade.