Can anyone help? I sold a new and unused VGA Cable to someone in Portugal and it does not appear to be working. The buyer says that he is getting a purple image but was not more specific. It was ten years old after all but had not ever been used.

Does anyone have any ideas on how to fix this or what indeed the problem may be? I have offered to give him a full refund but in his words, he would rather have the VGA working than the refund! Obviously if it is faulty and cannot be fixed I will refund in any case but looking to the experts for some advice please?