Japanese authorities reported Tuesday the first case of an Apple laptop catching fire in Japan and <A HREF="http://www.cnn.com/2006/TECH/08/29/japan.apple.ap/index.html">ordered the U.S. company to investigate</A> the trouble involving the faulty Sony batteries and report back within a week. A laptop made by Apple Computer overheated and caught fire in April, the Ministry of Economy, Trade and Industry said. The user sustained minor burns after the iBook G4 computer caught fire, according to Apple spokeswoman Michiko Matsumoto, who confirmed the case.