Hi, i've just purchased a powermac g4 400mhz very cheap, i've tried to get it booted but no joy, its my first mac and all I know is that I get a starting chime, a grey screen with an apple, then a black screen with text that says localhost:/root#, I have tried a few different keys at start up and got to what I think is a boot screen with three tabs, on the left is a refresh tab, in the middle is a drive with an X on it, and on the right is an arrow that just takes me to the text screen with localhost:/root# ,I have also followed some instruction on reseting the PRAM & NVRAM, Any help or advice would be great.