Dock is missing and unable to command+tab thru programs

Hey there, i'm running a powerPC G5 - and one day my dock just disappeared. Not only that but i found that i am now no longer able to "command+tab" thru the active programs.
Is there a problem w/ my finder?
My current system is 10.4.11
Thanks

Try creating an new admin user account in System Preferences Accounts pane. Log out and log in to the new account. Does the problem also recur under that different account?
If not, there is something wrong in your usual user account.
If it does recur, problem is in your overall system.

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