laptop don't boot and unusual keyboard blinking sequence

[ManuelOti]

When I press the power button of my laptop, the keyboard starts a blinking sequence. The fan starts and stops with the blinking, this continues for some hours and then fans start to work normally but loudly, the blinking stops and the keyboard lights up but the display remains black.

[A_Gayathri]

Hi @ManuelOti,

Welcome to the HP Support Community

I understand you are facing an issue with your HP Product. Not to worry I will help you to get a resolution to resolve the issue.

To assist better:

• May I have the exact model name of the product? Refer to this document for steps to find the product details. Do not share any of your personal information such as serial, phone number, email ID, etc.

Hope this helps! Keep me posted. 

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[ManuelOti]

HP EliteBook 840 G2

[ManuelOti]

It booted up normally yesterday and after some minutes it showed me this. It shut itself down and it is still flashing keyboard lights but the screen is still dark.