Apple is offering to replace the logic boards in faulty iBooks following threats of class-action by angry iBook owners who had complained of logic-board failures.

The iBook Logic Board Repair Extension Program is applicable worldwide, and will cover the cost of repair or replacement of the logic board in specific iBook models manufactured between May 2002 and April 2003, if they are experiencing specific component failures.

The relevant iBooks have serial numbers ranging from UV220XXXXXX to UV318XXXXXX.

Apple has also confirmed that it will reimburse iBook owners who have already paid for eligible repairs before this program was launched. The company also promises to: "Pro-actively contact affected customers where Apple has their contact information."

According to the company, to qualify for the program the iBook must have: "A particular component failure on the logic board, resulting in the computer starting up but the built-in and attached external displays exhibiting one or more of the following symptoms:

"Scrambled or distorted video; Appearance of unexpected lines on the screen; Intermittent video image; Video freeze; Computer starts up to blank screen."

The program covers iBooks for three years after the first retail sale of the unit.

To find out if your iBook is covered by the program call: the UK AppleCare Contact Centre on 0870 876 0753.