laptop does not power up
My ASUS K55V laptop does not start up anymore.
First it works for 3 seconds and turned off.
Then after pressing power button, it works 2 seconds and everything goes off
Then after pressing power button, it works 1 second and everything goes off.
This looks like an empty battery.
But it does not start on charger without battery as well.
Charger is working (19 V output)
Tried already the trick of pressing 30 seconds power button with all power off (without battery) for ATX reset function. This helps nothing.
What can be the problem? Or how to fix this?
Many thanks as the laptop is only 4 years old...