I don't know why, but the 10.5.1 update made my Leopard Install DVD stop working - repeated Failure Yellow Triangles with an explanation mark inside telling me the media is bad. I drove 100 miles RT to replace my Leopard DVD and the new one performed the same errors. I also had FW and USB HDs suddenly start spontaneously dismounting after the 10.5.1 update. Plus one wouldn't remount and the Leopard DVD Disk Utility could not repair it so it would mount. Finally gave up and put in my 10.4.4 2006 Tiger G5 restore DVD and it immediately successfully repaired and mounted that "lost in Leopard" external 500FW drive.
Something is screwy with Leopard big time after the 10.5.1 update on the Quad G5. After repeatedly getting the all these different Failure messages:
1. Installer could not validate the contents of the "BaseSystem" package. Contact the software manufacturer for assistance.
2. Installer could not validate "AdditionalSpeechVoices" package. Contact the software manufacturer for assistance.
3. The source media you are installing from is damaged. Try installing from a different copy of the source media or contact the manufacturer for a replacement.
4. The installer encountered an unknown error that failed the install. Contact the manufacturer for a replacement.
I just installed Tiger in no time from the 10.4.4 G5 restore DVD. Now running the hardware tests to make sure it isn't something besides weird software craziness in Leopard. Not having any of these problems with the Mac Pro 2.66.
Everything with Leopard was fine until I applied the 10.5.1 update from software updater on Thursday afternoon. And I used the Leopard DVD to Archive & Install Leopard from Tiger 10.4.10 on Saturday October 27. This is very mystifying behavior on the part of the computer and the system.
Hardware test crashed in the middle of checking the RAM. Does RAM fail years after it's installed? I thought that was only an issue when you first put it in.