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Hello @bhupendradhami
This indicates that keyboard ribon cable is not seated 100% to mainboard, it has come loose.
HP EliteBook 840 G2 Maintenance and Service Guide
Page 71 Component replacement procedures
Page 72 Chapter 5 Removal and replacement procedures for Customer Self-Repair parts
Page 73 Component replacement procedures
Page 74 Chapter 5 Removal and replacement procedures for Customer Self-Repair parts
Please report your results
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