Can't get back into Mac OSX 10.4.11 after having to hard boot the system

Greetings. I have a rather quirky iMac PPC G5 with now 2G of Ram and a 2.0 chip. This issue has happened several times, the most recent was today. If the computer locks up or has a kernel panic and I have to just turn it off and then back again...I get a grey screen for a long time with the arrows in a circle, then the fans go high speed and that's it. It doesn't boot into MacOS. I am using 10.4.11 and have an ATI Radeon card. I always have to use Disk Warrior (bless them) to rebuild the drive. Sometimes nothing has changed, other times it will say a startup value has changed. Why would this happen? I suppose I could reboot from the MacOS disk, because the process can take over 2 hours using Disk Warrior. Any ideas on the cause and the cure would be most appreciated. Many thanks. Debbie

When a computer isn't shut down properly the file system can be left in an unstable state. It is very common to be left in a situation where corruption of the directories etc occurs in such cases. Files aren't properly "closed", directory extents may be incorrect, etc. This matters much more with "modern" operating systems like OSX than it did, for example, with early versions of Windows etc.
That is the reason that I was wondering what was causing your kernel panics, forced shutdowns etc. After such events one should really ALWAYS rebuild the directories anyway, even if it WILL restart. Not doing so can lead to corruption that doesn't become evident until further down the track, causing things like freezes and panics of the type you experience.
If you experience such things regularly you should really try to track down the cause of the "freezes", rather than looking for ways to avoid having to rebuild directories.
That said, one way to reduce the impact of such things to some extent is to make sure that your have "journaling" turned on for your HD. Open up Disk Utility , select your HD boot volume (the "volume", not the 'disk" - the volume will be immediately below the HD, but indented a little to the right), and see if the "format" is given as Mac OS Extended (journaled). If not , look under the "File" menu in Disk Utility and you should see an option to "enable journalling". If it is grayed out you may need to hold down the "option" key to access it.
Journaling improves the ability of the drive to "self correct" after a crash by keeping additional records of file states and locations etc.
Cheers
Rod

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