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Step 3Test the Keyboard
Plug the keyboard into an available USB port. It's okay to leave another keyboard attached. The computer can see both simultaneously. To prevent entering erroneous data into an important document, we may want to open a new text file in TextEdit, WinWord or our favorite text editor...
Starting from any corner, start pressing one key at a time and note that the same key displays grey on the screen keyboard. Proceed testing every key and note those that don't respond. On this keyboard, keys 'minus', 'left bracket', 'semi-colon, and Space failed.
Note how the bad keys follow a pattern. This is indicative of a failure in the keyboard matrix. Just one trace would suffice to cause this failure.
Starting from any corner, start pressing one key at a time and note that the same key displays grey on the screen keyboard. Proceed testing every key and note those that don't respond. On this keyboard, keys 'minus', 'left bracket', 'semi-colon, and Space failed.
Note how the bad keys follow a pattern. This is indicative of a failure in the keyboard matrix. Just one trace would suffice to cause this failure.
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