Blackscreen, capslock & powerbutton led light on, charging led blinking

[Docingo]

Hi,

my Notebook HP ProBook 470 G2 is not turning on. Instead the

- power button led is on

- capslock led is on and

- charging led is blinking

I already tried a lot of things from different sites, like holding the power button for some time or disassembling the keyboard and try to turn on the laptop again. Nothing helped so far.

I also didn't find an explanation of the code that is presented by the different leds.

So can someone tell me or translate to me what the laptop tries to tell me with that code?

Maybe that can help, solving the problem. My planned next step would be changing the battery on the mainboard, but for that the whole laptop needs to be disassembled and if that is also useless i'd like to avoid disassembling the laptop for nothing.

Thanks in advance

Ingo

[Docingo]

Update: I changed the bios battery with no effect 😞

[RichIV]

My Hp Envy dv7 7227cl laptop basically does same thing. It powers on, caps lock key just blinks and NO key combos do anything.