Zoom keys not working on ibook g4, stuck on full zoom...

I was trying the zoom feature on my ibook g4, 10.4.6, and turned on zoom. I zoomed in but now can't zoom out or turn off the feature, as I am fully zoomed in. A reboot did not fix this. Upon login, I see my regular desktop for a few seconds, but can't get system preferences open in time to turn off the zoom. A box opens up called character palette and then my desktop zooms fully in. The keyboard shortcut won't work... When I first turned the feature on, I noticed the zoom in shortcut worked fine, but the rest would not. I use quicksilver and can get to my terminal "blind". Is there a terminal command to turn off the zoom feature? My user account is completely useless until I can zoom out...I will try to create another user to see if I can recreate the problem, but in the meantime... I have tried a test account and can recreate the problem. option apple 8 does not work to turn on/off zoom and option apple - doesn't work as well. Only option apple + works. I can't get into system preferences graphically once fully zoomed in as I can't see anything.

Hello again!
I'm sorry you're still having the problem. If you have a look back at my previous suggestion, you'll see that I didn't say "do an archive and install"! That will only help if the OS is corrupt.
I don't entirely understand the symptoms you're getting, but I do suspect a corrupt preference file (.plist) which is why I suggested zapping them both and nothing else. Archive and instal preserves .plist files, ensuring that if the problem is indeed related to them, it will not be cured.
However, you've now eliminated the possibility that the OS is corrupt!
So, could I suggest the following steps, since you now have a functioning user account?
0) Check that the keys are indeed giving you the characters you expect (normally =, - and 8).
1) Open the System Preferences—>Universal Access pane and check the keystrokes designated for Zoom.
2) Try the keystroke specified for Zoom on/off (default is cmd-alt-8), and see if the On and Off radio buttons toggle as you do so.
3) Go to the System Preferences—>Keyboard & Mouse pane and ensure that the checkboxes for "Turn zoom on or off", "Zoom out" and "Zoom in" are all ticked.
4) Try a single keypress of cmd-alt-= and see if the screen zooms in by a step. If all you get is an alert sound, press cmd-alt-8 and try again.
5) Try a keypress of cmd-alt-- (minus) and see if it zooms out again. If it doesn't, use the Zoom on/off keystroke to turn it off again.
6) If the problem still persists, then either quit System Preferences and use Terminal, or do what I suggested in my previous post, but zap those two .plist files. You'll have to reset other values, but at least it should rescue your system.
Keep us posted!
Archie
iBook G4 12" 1.2 GHz, G4 Sawtooth 400 MHz, PowerBook G4 17" 1.67 GHz Mac OS X (10.4.5)

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