First of all I'd like to state that the administration isn't responsible for any trading that goes on the forum.
With that being said,what has been made out of this particular deal is that the buyer did not know the functionality of the item he was going to purchase.The excuse that it doesn't run ipod without the cable which isn't supplied with it isn't good enough as the seller did not fall short of delivering on the condition of the item and the things that were being shipped along.You should've checked what was being provided at the time of the deal and not after it so that if he fell short of the commitment then you could complain.
Apart from that I would also advise the seller that the post could've been reported rather than retaliation and using a harsh tone which on your part was uncalled for as the first option both of you guys should've taken was to handle it like two mature people would.So everyone take this as a lesson that you should inspect and do your homework to know what you are purchasing rather than complaining about it later on even if the seller has fulfilled his end of the bargain,this is YOUR responsibility,not the seller's responsibility.
I would advise both parties to settle their differences via PM or cellphone if any.As far as the thread is concerned,this case is closed as I don't see any wrong doing on part of the seller except a harsh tone which I have already mentioned above.