[Steve]

I would not have the left the machine with him. I would have got my parts back and demanded a full refund. Furthermore I would write to the local newspaper explaining the full story in detail, I am sure they would be interested in a shot that believes its ok to steal from customers.

Finally, since your initial problem had a lot to do with the computer overheating I would be safe in saying that your rear fan is probably far from 'not needed'