On 29 December 2005 I posted a story on how Mac OS X software updates are disabling the lower RAM slot on some PowerBook G4 models (15-inch 1.67/1.5GHz). There are many comments from people that have experienced the problem and Apple is finally addressing it.
Apple has started a PowerBook G4 Memory Slot Repair Extension Program and has posted a detailed FAQ about it.
PowerBook G4s manufactured between January 2005 and April 2005 (serial numbers W8503xxxxxx through W8518xxxxxx) are covered and Apple will replace the RAM slot and extend the warranty on the repairs for two years.

The PowerBook G4 (15-inch 1.67/1.5GHz) Memory Slot Repair Extension Program is a worldwide program covering repair or replacement of the memory slot in PowerBook G4 models manufactured between January 2005 and April 2005 (2005-01 through 2005-04) that are experiencing specific component failures. If your PowerBook G4 has a serial number within the eligible range and is experiencing any of the symptoms listed below, it may be eligible for repair, free of charge. Apple or an Apple Authorized Service Provider (AASP) will determine eligibility under the program. Repairs will be covered by Apple for up to two years from the original date of purchase even if your computer is out of warranty.

On 29 December 2005 I posted a story on how Mac OS X software updates are disabling the lower RAM slot on some PowerBook G4 models (15-inch 1.67/1.5GHz). There are many comments from people that have experienced the problem and Apple is finally addressing it.
Apple has started a PowerBook G4 Memory Slot Repair Extension Program and has posted a detailed FAQ about it.
PowerBook G4s manufactured between January 2005 and April 2005 (serial numbers W8503xxxxxx through W8518xxxxxx) are covered and Apple will replace the RAM slot and extend the warranty on the repairs for two years.

The PowerBook G4 (15-inch 1.67/1.5GHz) Memory Slot Repair Extension Program is a worldwide program covering repair or replacement of the memory slot in PowerBook G4 models manufactured between January 2005 and April 2005 (2005-01 through 2005-04) that are experiencing specific component failures. If your PowerBook G4 has a serial number within the eligible range and is experiencing any of the symptoms listed below, it may be eligible for repair, free of charge. Apple or an Apple Authorized Service Provider (AASP) will determine eligibility under the program. Repairs will be covered by Apple for up to two years from the original date of purchase even if your computer is out of warranty.