hi there. Just bought DiskWarrior 4. Tried to open it and my mac G5 ejects the DVD immediately. Have tried resetting PRAM and NVRAM as well as repairing Disk Permissions. Nothing's worked. I can play movies no problem on DVD player so drive doesn't seem to be broken. I also tried starting the DiskWarrior DVD on my laptop and it works fine so it seems Disk is fine. My G5 is about four years old and was upgraded to Leopard earlier this year. Any ideas would be helpful. Thank you.