IMac stuck in home screen - mouse & keyboard don 't work after Apple Update

I just updated my iMac by hitting the Update button in the left upper screen.
After collecting 98.1 Mb of Update-tools i had to restart my iMac.
During shutdown it installed the components, as normal.
Once restarted, it brought me back to the home screen, where everything looked
normal. Problem is, that the iMac doesn 't respond to my mouse and keyboard anymore. Cursor is left of the apple in the left upper screen and doesn 't move an inch.
I discovered during a couple of restarts, that immediately as the apple appears in the white screen ... that Caps Lock modus is switched on. I am not able to switch it off.
Who knows what's wrong ? Please don t tell me to use my OS Tiger cd's .. because i later installed proper Leopard version, but these cd's are not with me at this moment.
HELP !

Hi !
Well, it is the wired keyboard and wired mouse. I tried as you told me,
but up untill now there 's no difference and everythings' still stuck ..
I tried the hardware test that you can do with CD 1 .. and everything
seems to work fine. At that point ( after startup hold D-button ) you can
control both mouse and keyboard.
When you then choose for startup from Mac OS Hardrive ... the whole problem
starts again. Caps Lock is ON ( green light ) from the moment you enter the
home screen.
The problem i have is that the original cd's that came with this imac intel duo core .. are OS Tiger. A friend of mine clean installed Snow Leopard 6.1. so i can t reinstall on a short term. I also would regret it if all my files would get lost.
Thanks for your quick respond. Please help me out !
Roger

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Has your keyboard and mouse quit working altogether or just when the computer is hot? And do I understand that an external keyboard and mouse will work with no problems?
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