My optprite DD0203 won\'t read anything

[qanda]This question is published in the hardware section for the OptoRite DD0201/DD0203. Click here to view full specs.[/qanda]It randomly started being like this. It is like the drive isn’t going in all of the way or something. It will close and it makes thud sounds like it is trying to open back up but can’t. Then it randomly started to go in and out all of the way but still will not read the discs. The computer says it is trying to read it but nothing happens. Then I go to take the DVD back out, and it won’t open. It only opens about half of the time. Oh, and it is making some weird grinding sound. Can someone please tell me what is wrong with it?