HP EliteBook laptop: Why does the Caps Lock and Power button keep blinking?

When I connect the HP EliteBook 840 G1 laptop to my power cord, the Caps Lock button and power button blink continuously. The laptop can't be switched on. How do I solve the problem?

Remove the battery and power pack, then leave it there for about half an hour and then try to switch it on again.

And if you let off network cables?

Or if you mean power cables, what happens without a power cable?

It won't work without a power cord. Nothing blinks. What can I do?

Shouldn't be permanent. Is there any pattern when blinking? For example, blinking x times, then pausing, then blinking x times, etc?

No, both flashes permanently. And the laptop won't work without a power cord. What can I do?

You can try to operate the notebook without a battery.

With a little luck, only the power supply or battery is defective

Is now a few years old, the power supply may be defective.

Does it look like this: https://h30434.www3.hp.com/t5/Notebook-Boot-and-Lockup/HP-EliteBook-840-G1-Doesn-t-start-up-at-all/td-p/7166714?

I just took out the battery, put the power cord on: the same problem as before. The power supply works in any case, e.g. Eg with another laptop that I have. What else can I do?

I then suspect a problem with the charge controller in the notebook, because it does not work if no battery is installed and the power supply is OK according to your statement.

There's not much you can do now, either for repair or buy a new one.

Unfortunately, so that many devices do not last that long, you can also be "satisfied" that it has made it 6 years.

Of course you can try again with a new battery and if it doesn't work then send it back. However, don't think this is the problem.