Can´t eject cd

I've found that a small pair of tweezers can sometimes help in getting the CD out. Unfortunately, due to the way the PowerBooks (and first Macbook [Pros] were manufactured, the optical drive was placed in a position which could easily be damaged. In my experiences, the physical drive can become bent, thus preventing it from spitting optical media back out.

Press Hold Mouse Button when you listen the chimes start up sound, and maybe you can try with external USB Drive.

Glad you got it out with the Open Firmware command!

For disks stuck in drives that are defective (or a nonstandard disk or other item got inserted) and absolutely won't eject a disk no matter what you try, you can disassemble the computer and take the optical drive out, from where it's pretty simple to reassemble the drive and the computer. Of course the drive might have been damaged, in that case you'd want to replace it.

BTW two replacement drives I've installed didn't exactly match the bezel or opening, little screw holes or whatever didn't match up; you can make it fit by breaking those off, because the drive is held in sufficiently by its other connections. This can save returning what you think is a wrong part, which happened to me, and the replacement drive also didn't match. I forged on ahead anyway, and got a working drive in the end.