how much to subtract for broken hinge when selling a laptop?

[majorduck]

Hello, I currently have a Lenovo y-50 laptop. A while back, the left hinge broke (which I hear is a common problem) and I did a sloppy job of repairing it (I had to screw into the back plate and put a bolt on the back of the lid). I'm planning on selling it on ebay and I'm not sure how much to subtract off the average of ~$650.

P.S. there is no warranty

 

[cdabc123]

50 however things will rarely sell for the average on ebay only the bottom 20% normally sells

 

[USAFRet]

Unless I was looking for it for just parts...broken hinge = non-sale.