Faulty CD Duplicator Tower

We bought a Tower Duplicator from you on the 14 December 2004. It is now, obviously, out of warranty but it has stopped working, or is atleaste very intermittent. When it is used it comes up with error messages, such as "Source Drive Not Ready" or "Target Drive Not Ready", that it cant copy the disks or it fails and wastes lots of disks. It keeps doing this how ever many time you try. The Original purchase will show the name Matt Bass and the Post Code NN10 0GA. We have since moved and it now falls to me, which is why the details dont match.