Ok, so a friend of mine gives me his iMac PowerMac4,2 a few weeks ago, says he hasn't booted it in so long that he forgot his user password. Wants me to reinstall the OS, but when I do, it always asks for the password for the account. It is currently running OS X 10.4.11. So my question is can I boot from an external DVD drive to reinstall the OS? I have a Tiger DVD, and since the system doesn't have a built-in CD or DVD drive, I have to go external. I connected a DVD drive via USB, but when I boot holding the "Option" key, all I get are icons showing the 2 partitions currently on the hard drive, it does not see the external DVD. I read somewhere that this system won't boot from USB external drives, but wondering if that is true. I do not have a way to connect it by FireWire, but there is a FireWire port on this system. So in saying all of this, how can I wipe the system clean and reinstall the OS fresh? I'm running into brick walls on this situation, so any help would be appreciated. Thanks!!!!!