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Microsoft Windows 10 (64-bit)

I have hp elitebook 840 g1

It boots sometimes and sometimes does not boot

When i press the power button and try to boot on battery there are 2 orange light and 1 white light and black screen and caps lock blinks for 5-6 times and then fans starts running and no display

If i boot without battery on charger, than the power button blinks with no display

And it sometimes boot on battery (rarely - one time in a day if i try 20 times)

I have tried everything

I have updated the bios when the laptop was on

I also remove battery and keep my power button pressed for a minute, but nothing works

When i sometime remove my battery, ram, cmos and then connect them after sometime than it often boots, but after 2 or 3 restarts the same problem comes again

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