A mac pro booted to the flashing question mark folder after the hard drive started making unnatural noises. I replaced the drive. When I boot, now, it briefly shows a black screen, then makes the Apple chime noise, shows a gray screen, pauses for some time, then shows the flashing question mark folder. I want to eject the optical drive so I can boot leopard and install on the new hard disk. There should not currently be a disc in the drive. I have tried holding down the eject key at the flashing question mark screen, tried booting while holding Option, booting holding Cmd+Option+O+F, and holding the mouse button. It just continues the aforementioned routine and goes to the blinking question mark folder. I understand that if I could get to open firmware I could easily eject the drive, but I cannot get there. Maybe I'm not holding the key combinations at the correct time? I've tried before, during, and after the chime, and just holding them before even pressing the power button. I also tried booting without the apple keyboard/mouse to make sure a stuck button wasn't the problem.