Brings back memories..
I had a customer literally come in with her G3 Mac Book in pieces in a plastic shopping bag, fully disassembled one day and she had to have it up and running the next day. I am a PC tech and had never worked on Macs before, but though trail and error, (i treated it like a big jigsaw puzzle) got the whole thing back together and found out she was missing the power supply/sound board. She had told me when she dumped this bag off that the last tech told her she needed a new power supply, so she went and got one, not the board. LOL After i was done, she took it to the Apple repair center and they were impressed that I had done such a good job with no instructions. -She never got that board, she just bought a Mini-mac at that point.