wait one sec... just to get this straight... you didn't end up buying it right? so why are you complaining.
you can't guarantee any used parts, especially electronics. you should be happy he let you test it and didn't force you to buy it.
i've actually done that mistake before where i have guaranteed that all the bulbs in a set of lights were working (and i sold it to you actually
). and i was pretty sure all the bulbs were working when i took them off.