I recently sold my pre-unibody MBP on craiglist and the buyer text messages me last night saying its having a problem. It is kernel panicking. I told the buyer to do a disk permissions and dipsk check and repair both. I will also be giving them a snow leopard re-install disk which I didn't originally include to try and rectify the situation. Before I sold it it was my daily machine for home and work use and ran perfectly. If it is a ram stick went bad I do have a spare piece to provide them if it comes down to it. What would you all have done in this situation? I do not plan on taking it back.