Hi Patient readers... I posted three night ago: I attempted to install Panther (10.3) on an iMac 400 without updating firmware first... Yes, foolish, I know: I have beating myself up ever since. Now, the iMac will not start up. I have tried every single hint given on-line (including the wise poster in previous thread who directed me to a very informed site). My question: At start up, how do brand new Macs get their instruction? Is there a key combo? I have a G3 iMac 400 with FireWire (Graphite) and it shuts down after 7-10 seconds.... What can I do boys and girls? The PRAM seems to be corrupted, because before trying to install OS X it was happily booting into OS 9. Please help me save a good and sexy Mac from being a doorstop.... Thank You in Advance.