Leopard Keyboard Problems
The Leopard OSX operating system was a major upgrade to how Apple's line of Macintosh computers work. It went deep into the code to streamline how OSX works. But while Mac users found many new technologies and additions in Leopard, they also discovered it brought along some keyboard problems. These keyboard problems can pop up unexpectedly and cause difficulties, which can derail the smooth and continued use of Mac desktop and laptop models.
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Keyboard Unresponsive After Sleep
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The keyboard stops functioning shortly after being waken from the "Sleep" mode, although the mouse continues to function. Pulling the USB cord from the keyboard that goes into the computer's USB port and then reinserting it can sometimes cause the keyboard to start functioning again. If it doesn't work, a reboot is the only other recourse.
Keybaord Stops Working During Session
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The Mac's keyboard stops working during use and this can happen at any time. Some Mac users have found that resetting the PRAM and NVRAM can eliminate this problem completely. Shut down the computer after the keyboard has stopped working. Hold down the "Command," "Option," "P" and "R" keys simultaneously and start the computer. Release the keys when the Startup sound is heard for the second time. Release the keys.
The default settings that have now been set up must be returned to those used before the PRAM and NVRAM was reset (see Resources).
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Some Keys Don't Work
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There is always the chance that the keyboard being used with a desktop Mac has become defective and needs to be replaced. Try attaching another keyboard to the Mac to see if the keyboard functions without problems over a period of time or in similar circumstances where the other keyboard has stopped working. If the new keyboard doesn't exhibit any problems, then you know that the fault lies with the first keyboard.
Keystrokes Fail To Register Sometimes
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Keys that suddenly stop working for a few minutes before resuming to register indicates that there is a keyboard problem in effect. Pressing "Numlock" repeatedly for five or six seconds can cause the keys to start registering keystrokes again.
Switching a Bluetooth mouse that is plugged into the Keyboard on and off a couple of times can also cause the keys to start registering keystrokes again.
Software Causing Keyboard to Stop Working
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Software programs can cause the keyboard to stop working. Be sure that the third party software being used is the latest version and updated to work with the Leopard operating system. If it isn't, update the software so that it is compatible with Leopard. Otherwise, do not use the software until an update for it for Leopard has come about.
Expert Insight
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The USB cable from the keyboard could have jiggled loose or otherwise not be making a good connection with the computer's USB port. It is worthwhile to remove and reinsert the USB cables, especially in the case where a USB extension is being used for the keyboard.
Considerations
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Apple periodically releases system updates to correct and fix problems. Check whether there is a system update for the specific Mac model being used that is designated for repairing keyboard problems. If there is such an update, install it and reboot the computer.
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References
Resources
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