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Amber light blinks continuously in power LED alone. Black screen shown forever after HP logo

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

Hi,

 

When power button is pressed, an orange light blinks continuously(with 1 sec delay) and the screen is black and nothing happens. When i checked by turning on the lap without battery, I was able to login and then performed a diagnosis in which everything passed. Again when i start with battery, i face the same amber light blink &. Black screen issue. When turned on without battery for the second time i get 90b fan error.  I got my fan cleaned and checked- its fine.  Checked my battery in another device - works perfectly. Also no issue with my adapter. 

 

Performed  reset by holding power button 15 sec as suggested in forums - Dint work.

Updated bios - No luck

 

Can you please suggest a solution for this? Or help me identify why this is happening.

 

Thanks.

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