As noted on an earlier thread, I unplugged the power from my Mac and attached it to my printer w/ USB. It printed half a doc and then shut down. It wouldn't restart until a plugged the power back in. Eventually, I turned it over and saw that the battery popped: Is it possible that the printer could cause this, or was it just the batteries time to die? I assume that after 4 years, Apple won't replace the battery, and I should just buy a new one?