How do you get the CD compartment to stop making loud Grrrrrrr sound?

1) it takes 2 or 3 tries to get it open to take out the CD.
2)Closing it (without a CD) makes it do a loud Grrrrrrrrrrrr sound, so either it has to be left open, or the power source has to be unplugged. Plugging it back, no change.
So, I suppose I have to ask the person who this happened to (she is not home for a while) to see if the same sound will occur with a CD in it, but in the meantime do you have a suggestions?

ADD: It is not on a computer, it is a stereo equipment.