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The connection of cable and board may be defective. Otherwise, they may be faulty. 
Disassemble the computer following the steps described in Chapter 4, Replacement 
Procedures, and perform the following checks: 

Check 1 

stem board. 

Make sure keyboard cable is firmly connected to sy

 

If the connection is loose, reconnect firmly and repeat Procedure 1. If the problem 
still occurs, go to Check 2. 

Check 2  Keyboard may be faulty. Replace it with a new one following the instructions in 

Chapter 4, Replacement Procedures. If the problem still occurs, perform Check 3. 

Check 3  System board may be faulty. Replace it with a new one following the instructions 

in Chapter 4, Replacement Procedures.