After updates, wireless keyboard stopped working.

HI...
All was going along swimmingly, setting up my new iMac... I did some updates and then for some strange reason my wireless keyboard stopped working? I know it’s not the keyboard because delete works, my widgets work and some other keys work - and - the whole keyboard was working from start up (at first)...
But I just can’t use the Alfa keys all of a sudden - very unusual, no?
What happened?
Any opinions, suggestions and comments are greatly welcomed
Thank you in advance....

For those who it may concern...
I called up support and I had to delete two files from the Systems Library called “com.apple...systempreferences.plist” and “com.apple.universalaccess.plist”.....
I hope you never need this information but - it worked for me....

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Hi..If anyone can help me, I appreciate..
i allways use my wireless keyboard and mouse with my imac and i never had a big issue with the kb\mouse... until recent,that i stored my imac ,mouse and keyboard inside their respective boxes.
off course i put bateries out,nothing had fall and when i return after 1month, the keyboard stop working!!
stop working completly even the backside light is off and i put new bateries.,,,
i turn on the bluetooth from the imac and nothing is coming there..
anyone have any idea about this??
thankx...
i have been usilllllçlçlng

thankx..but i already check all those post and apple info pages...
i really dont understand...the keyboard was in the box inside the imac box ,with the imac inside..nothing broken for sure..just the keyboard stop working..
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the keyboard its a aluminium model without on\off button,

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Please read this whole message before doing anything.
I've tested these instructions only with the Safari web browser. If you use another browser, they may not work as described.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
These steps are to be taken while booted in “normal” mode, not in safe mode. If you’re now running in safe mode, reboot as usual before continuing.
Below are instructions to enter some UNIX shell commands. The commands are harmless, but they must be entered exactly as given in order to work. If you have doubts about the safety of the procedure suggested here, search this site for other discussions in which it’s been followed without any report of ill effects.
Some of the commands will line-wrap or scroll in your browser, but each one is really just a single line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then copy it. The headings “Step 1” and so on are not part of the commands.
Note: If you have more than one user account, Step 2 must be taken as an administrator. Ordinarily that would be the user created automatically when you booted the system for the first time. The other steps should be taken as the user who has the problem, if different. Most personal Macs have only one user, and in that case this paragraph doesn’t apply.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign (“$”) or a percent sign (“%”). If you get the percent sign, enter “sh” and press return. You should then get a new line ending in a dollar sign.
Step 1
Triple-click the line of text below on this page to select it:
kextstat -kl | awk '!/com\.apple/{printf "%s %s\n", $6, $7}' | open -ef
Copy the selected text to the Clipboard by pressing the key combination command-C. Then click anywhere in the Terminal window and paste (command-V). A TextEdit window will open with the output of the command. If the command produced no output, the window will be empty. Post the contents of the TextEdit window (not the Terminal window), if any — the text, please, not a screenshot. You can then close the TextEdit window. The title of the window doesn't matter, and you don't need to post that. No typing is involved in this step.
Step 2
Repeat with this line:
{ sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix\.cron)|org\.(amav|apac|cups|isc|ntp|postf|x)/{print $3}'; echo; sudo defaults read com.apple.loginwindow LoginHook; echo; sudo crontab -l; } 2> /dev/null | open -ef
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Step 3
{ launchctl list | sed 1d | awk '!/0x|com\.apple|org\.(x|openbsd)/{print $3}'; echo; crontab -l 2> /dev/null; } | open -ef
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Step 5
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After updates, wireless keyboard stopped working.

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