Long story short, I went to the Apple Store to get my iMac repaired and also brought in one of my old white mag safe chargers that doesn't work anymore. The guy working there said he could swap it out, he just needed a serial number. He looked up my info and couldn't find one. Then he said to just grab the serial when I went get back home and bring it with me when I pick up the iMac and they'll swap it out. Problem is that I have a new unibody white MacBook, which I got a new charger with. I do not have the serial for my old MacBook that I sold and cannot trace it down whatsoever. Should I just give him the serial of my new MacBook or can I just use a friends possibly? Any input is greatly Appreciated!