HP pavilion charges but do not turn on

Hi guys, I need your help
I did not use this laptop for a while and this afternoon i tried to use it to get some files, but i was not able to make it start.

When i press the power button, it lights on for one second but that's it .
The screen doesn't turn on, i can't hear any fan going and i have no power from the USB ports.

The charge indicator does work, and now indicates that the battery is fully charged.

I looked for some solutions online but did not find anything other than the basics troubleshooting things (disconnecting the battery and pressing the power button for a minute, try turning it on only with the power adapter plugged in,...)

The exact model n° of the laptop is ec2200nf

I would appriciate any help, because i can't afford to replace it right now