Apple is voluntarily recalling 570,000 power adaptors that were sold in the US with older PowerBooks because they could overheat, creating a potential fire hazard.

The recall affects adaptors sold for use with PowerBook G3 units shipped from May 1998-March 2000. It does not affect units shipped in Europe, the Middle East and Africa. Apple said it had received six reports of the adaptors overheating. The company said no injuries have been reported.

Apple said customers should stop using the adaptors and not leave them unattended while plugged into any power outlet. The company has initiated an exchange program and will provide a replacement AC adaptor, free of charge. Details of this program are available on Apple's site.

The recall affects AC adaptors with a two-pronged connection that came with PowerBooks or that were sold separately. The small rectangular black adaptor has a permanently attached cord on one end that connects to the computer and a detachable two-prong cord on the other end to plug into an AC outlet. The label located on the side of the adaptor reads: "Macintosh PowerBook 45W AC Adapter" and Model Number: M4402.

These were designed for use in North America, Japan, Latin America and Asia. The recall doesn't affect units supplied for use in Europe, the Middle East and Africa, as these use a three-prong connection (Model Number: M5159).