Dmg files won't mount, Disk Utility/Toast won't launch?

Hi folks,
I've just joined your fine community in search of help with my problem that I see on Google pops up on boards frequently... but no suggestions have helped me yet...
In a nutshell, if I download any dmg file, eg. Apple updaters, they won't open - the error dialogue is something like "failed to open, no mountable file system". This seems to be an underlying general error, as I also can't launch disk applications like Disk Utility and Toast. They just bounce in the dock and then quit.
I have:
- rerun the 10.4.4 combo installer
- done /sbin/fsck -yf at startup - all reported ok
- booted from and run Disk Warrior - all reported ok
- booted from and run Techtool Pro - all reported ok
- switched to another user account.
And the problem with dmg and Disk Utility/Toast persists! In all other respects, the Powerbook G3 (576mb/80gb) is running fine (apparently).
Hope someone can help
B
Powerbook   Mac OS X (10.4.4)  

I just went thru a simular problem. A couple of things to try.
Boot of your install disk and ignor the install window and open disk utility from the menu at the top. you are running off the o/s on the disk an not the hard drive. You can repair permissions and the Hard drive because you are now working off a different filesystem.
If that doesn't work do a rinstall from the install disk but when you get to the window that has an "options" button select it (you may have to) and instead of doing a full install. Uncheck all boxes. This way it does not reinstall fonts etc.
You will not lose any files or programs or have to reinstall them. You might have to reinstall devices that have special drivers like printers that came with an install disk etc.
You will revert back to the origional ver like 10.4.1. just go to apple update and let it do its thing.
Good luck

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