I've got a friend who's relocating to another country for work, and he's asked me to help pack his computers. In addition to a bunch of laptops (and their accessories), he's got a single desktop PC tower and an 18" LCD monitor. The laptops are easy enough to handle, but what about the tower? He just happens to have the original boxes for both the case and monitor, so could I just stuff them into the boxes with some old clothes on the sides for padding? Bear in mind he's not going to be shipping this separately, he wants to bring it on as checked baggage on the plane.
Assuming that he could do that (and I really don't see any reason why he couldn't), what sort of precautions would I need to take? Do I need to do anything special to secure things like the HD and any expansion cards like his GTX550 ti? I've heard that the heat sink can damage the mobo in transit, is this true?