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According to this site, some Apple Powerbooks could have defective RAM slots.
It is possible to repair them, but the problem will reoccur because of a combination of hardware and software problems.
Some think that the problem is that the upgrades of the Apple OSX operating system results in physical damage to system hardware making the second memory slot unreadable.
It is possible that the 10.3.9 OSX upgrade or in some cases the 10.4.0 and 10.4.1 OSX upgrades actually damages the motherboard firmware controller or chipset. In rarer cases where the computers are still under warranty, Apple is replacing the motherboard to fix the problem.
However a large number of machines are out of warranty and Apple refuses to repair them.
When they are repaired and the 10.3.9 OSX upgrade or in some cases the 10.4.0 and 10.4.1 OSX upgrade is carried out through Apple's automated update system, the problem recurs.
Other users are finding the problem emerging when they add additional memory CL 2.5, DDR2700 Ram to the second available memory slot in these G4 PowerBooks. µ