Lenovo ThinkPad 560 Thinkpad 560 User's Guide - Page 179
Problem, Action, Shift, NumLk, the external keyboard serviced.
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Troubleshooting Problem All or some keys on the external keyboard do not work. A number appears when you type an alphabetic character. Action To use an external keyboard, you need to attach the keyboard/mouse connector to the computer. Verify that: The keyboard/mouse connector is correctly connected to the computer. The keyboard connector is connected to the correct side of the keyboard/mouse connector. If the preceding items are correct, disconnect the keyboard/mouse connector from the computer and verify that the operation of the system keyboard is correct. If the system keyboard works, have the keyboard/mouse connector or the external keyboard serviced. The numeric lock function is on. To disable it, press and hold Shift; then press NumLk. Chapter 8. Solving Computer Problems 161