IMac doesn't recognise keyboard (wireless and usb)

Hi!
I've seen similar posts, but non had advice that helped. I'm having this problem for a weeks, before the problem everything worked perfectly. My Apple wireless keyboard start to act strange. I couldn't type some letters, so i put new batteries and still the same problem. When I type for example letter S it appears on screen as DS, the light on the shift key doesn't turn off when pressed. I have also tried to unpair it but now i can't even pair it with the computer any more.
I have bought A4tech KD-126 keyboard which was recognisable by the computer till first time i unplug it. After i tried to plug it in all usb ports, led lights on the keyboard are working but computer doesn't recognise it as a keyboard.
So I have tested other keyboard which my husband is using (A4tech KB-28G) and this only keyboard that works for now.
I want to make A4tech KD-126 keyboard working at least.
Please Help!!

Reset the NVRAM/PRAM and Reset the SMC, then try the wired keyboard again.

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This question was solved.
View Solution.

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Have a wonderful day!
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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[Edited by: admin on 06-Apr-06 06:51]

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Apple doc for you:
Apple Wireless Keyboard and Mouse: About the Bluetooth Firmware Update
* Last Modified on: December 09, 2003
* Article: 86493
The Apple Wireless Keyboard and Mouse software CD include a firmware updater. You can use it to update the firmware of your computer's built-in Bluetooth hardware or a D-Link DBT-120 (rev B2 or later) USB to Bluetooth adapter.
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For optimal performance of the Apple Wireless Keyboard and Mouse, you should install the Bluetooth Firmware Update. The firmware update can improve the performance of the mouse and keyboard by decreasing connection and tracking issues.
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Document 17159, "Locating Vendor Information" can help you search for a particular vendor's address and phone number.

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IMac doesn't recognise keyboard (wireless and usb)

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