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HP EliteBook 840 G8 Notebook PC (19X35AV)

Got the black screen on the laptop. Ventilator is on, power button is constant white and both mute buttons constant orange.

laptop_lights.jpeg

Light from cable connector is blinking orange.

 

Tried hard power reset - did not help.

Connected external monitor - shows "no signal".

Disconnected the battery - still same problem.

Did reset CMOS battery - no changes.

Finally bought new RAM. It worked. After about 4-5 hours - got again black screen and I'm back to the same problem.

Tried switching RAM slots - nothing.

 

Any ideas what problem it could be? Why after putting new RAM it worked for few hours?

 

Another note, after plugging the power cable - laptop switches on automatically after few seconds.

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