I just bought an old G4 gigabit 400 mhz. Came w/ no ram and no hdd. I put 2 x 128 pc133 ram and a 40 gb hd w/ os X 10.3.9. When I turn on the tower I get 1 long beep, followed by 3 short beeps (ram?) - the g4 will then boot to open firmware. If I enter "mac-boot" the box will boot to OS X off of the hdd. Why won't it boot directly to the HDD??? BTW - I am a mac newbie....