Keyboard lockout after screen sharing

I was doing some screen sharing from another Mac on my LAN. There's no "disconnect" feature to stop the remote control, so I simply quit the Screen Sharing "application," closed all windows, and logged out of the controlling Mac.
Problem is, at the target Mac, upon every other restart approximately, like this morning after software updating, the keyboard is locked out. Entire keyboard has no effect. Mouse control is okay. The other Mac wasn't touched for days, while this target Mac has been logging in and out just fine. The restart puts me in a state where I cannot type in my login password, and restarting (with mouse) brings me back to the same state, restart after restart. I don't think it has anything to do with the software update, but instead, some kind of residual control from the other Mac that was not fully severed upon quitting.
Even after going back to the other Mac to remotely log into Finder via screen sharing, the keyboard in the target Mac is still like disconnected. Mouse control still okay. Same problem.
Any solution?

Entire keyboard is locked out EVERY TIME my Mac is restarted! Not just every other time. I mean NOTHING on the keyboard works when locked out -- like it's disconnected, but there's no physical disconnection.
The iffy workaround that gets me back to normal, and only sometimes, is restarting via screen sharing from the remote Mac, then "closing" +Screen Sharing+ (it quits immediately), then quickly logging out of the controlling remote Mac. And THEN I still have to restart the target Mac several times to get lucky! For example, just now restarting five times did not work, but going through the gyration again + restarting twice got me back.
Remote Mac = 2005 Powerbook 15" G4 running 10.5.5
Target Mac = 2003 Dual 2GHz PowerMac G5 running 10.5.5
This new phenomenon came about only after I used +Screen Sharing+ on the LAN.
Help!

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Hi there, it´s a bit long story.
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<
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 G4/1GhzDual MDD (Leopard 10.5.8)
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Keyboard lockout after screen sharing

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