Instruct: Classify a review into positive or negative sentiment.
Query: Not what I thought it was

It's my fault. I should have known that buying this particular Macintosh OSX system for my Mac Pro computer was not going to work. This isn't the fault of the seller. I got the product in good shape and sooner than I thought. Now I need to find a buyer for it who can use it. It is a good product - just not proper for my computer.