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Elitebook not switching on or power button switching on and off

HP Recommended
Elitebook 840 G1
Microsoft Windows 10 (64-bit)

Hi, after pressing the power button all keys, wifi , volume, power button is lighting up and again they are getting stopped. This is happening repeatedly with 1to 3 seconds gap. 


Sometimes i could open the home screen and desktop, post opening withing seconds above blinking sequence is getting started.


Some times with blue screen i could see APC index mismatch error and blinking sequence is getting started.


I have tried removing battery and starting with charger, trued bios reset with USB. But within seconds blinking sequence is getting staryed. 


Need some help

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