Certain keystrokes not working

On my dual G5 2.5 with the white pro keyboard there are some key combinations that won't work.
This is the left "shift" in combination with the "o" key and the left "alt" key in combination with the "l" key to receive a "@" (this is on a german keyboard).
Left shift and alt work with any other key and "o" and "l" work with the right shift and alt.
So does this look as a malfunction of the keyboard? Or could this be system related?
Any insights would be very much appreciated.
Ralf

Hi Ralf, and a Warm Welcome to the Power Mac G5 Forum!
Have the keys been working ok, and just stopped working? If so, it may be hardware fault.
If you haven't tried this already... you can go to System Preferences > International > Input Menu and there you can check the language selection, enable 'Keyboard Viewer' and enable 'Show input menu in menu bar'.
Then you should get a little flag at top right of the Finder menu bar; select it, and then select 'Show Keyboard Viewer' and you should then be able to see what pressing the various keys and combinations of keys on the keyboard will produce.

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