Mac OS X 10.4.2 (#7): Loss of Ethernet connectivity FireWire drives unmounting - power adapters to blame? more.Mac OS X 10.4.2 (#8): More on FireWire drives unmounting Ethernet connectivity problems: Make sure DHCP is selected more.
Mac OS X 10.4.2 (#13): "System does not meet requirements" error message.Mac OS X 10.4.2 (#14): System fails to startup/shutdown properly, possible solutions.Hold the keys down until the computer restarts and you hear the startup sound for the second time.Press the power button, then immediately begin to hold the Command, Option, P and R keys.In many cases, this issue can be resolved by resetting PRAM and NVRAM via the following process: Problems with PowerBook backlight functions, fix We've received a number of reports that backlight-control keys stop functioning after the Mac OS X 10.4.2 update. (Sometimes a file is created instead of a symlink see below for details.) Be sure to check the contents of all files listed in the DamagedFiles folder as well as in the output from Disk Utility or fsck. If the original file is a preference file, it's best to just delete it and recreate preferences from the associated application.
Depending on the file, you can then determine if is still usable or if necessary, replace it with a backup. Use the link (or links) to locate any affected files.
If Disk Utility or fsck reports this issue on your Mac OS X volume, do not install any additional software " Although this is a very rare situation, at least one of the affected files will likely have data loss. "Overlapped extent allocation means that two files occupy the same space on your hard disk. New version of Disk Utility can fix "overlapped extent allocation" errors As noted in Knowledge Base article #25770, the version of Disk Utility (10.5.1) included with Mac OS X 10.4.2 can fixed overlapped extent allocation errors - problems with disk directory structure that can cause a variety of issues including data loss.