BIKeINSTEIN said:If it's a LGA775 P4 processor, should work on that mobo.
I hope he atleast pays for the shipping charges incurred by the seller as it's his mistake buying the wrong item.
It's good you are taking it back, as most genuine, non-enterprising sellers do but buyer should have been more responsible.
Who accepts responsibility in case goods get damaged in transit or while not in possession of the seller? :no: