Applications/documents not opening from Finder/Desktop

iMac 17" 800. I returned home after 3 months away to find the iMac in a mess (it is used by my wife and daughter). I repaired preferences and then found the disk to be not repairable with Disk Utilities. I started as a Target Drive and repaired from my MBP using Mac Pilot. Disk Utility showed repair to be good.
The problem is that I can start applications from the Dock and from the Finder using the "Action" box>Open. I cannot open an application by clicking on it nor a document in the Finder. Folders on the Desktop are equally not responsive.
I have done an Archive and Install to Tiger 10.4 and updated back to 10.4.11. The fault was the same throughout. I have deleted User/Library/Preferences/com.apple.desktop.plist-com.apple.finder.plist-com.app le.LaunchServices.plist. All to no avail and the fault remains.
The only other outstanding fault is that the Return key on the keyboard appears to be out of action, although I now get an audio acknowledgement of it being pressed, if nothing else. I am, as all the above has so far failed, wondering if there is some obscure connection?
Any ideas would be much appreciated.
TY
PS Can a keyboard still be flushed out under the tap?

To those of you who might have the same problem!
Just after making this post, I decided to try logging out and logging back in, something I had not done, as far as I can remember, since the computer came out of the box some years ago. I have no idea what happens when you do this with regard to software, but lo and behold, everything is working again. How this happened after an archive and install plus all the upgrades failed to achieve anything I have no clue.
Now to stick the keyboard under the tap - you never know!?
TY

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