I have a Power Mac G5 Dual 1.8GHZ. Here's what happens : - I press the power button - I hear the apple boot sound - Nothing displays on the screen... I have no idea if it does something or not afterwards. Here's what works : - I press the power button and hold it for a long time (It boot up, does it's long beep, does the boot sound), then the Open Firmware screen appears. - I type "mac-boot" in the firmware and it boots normally (I can access OS X). I would like to restore the default behaviour of it booting normally without having to boot it from the firmware every time. I wonder if anyone could give me cues as to how to debug this problem. Thanks !