Hi @luanhenriq10963
Can't see that you mentioned trying a power refresh by removing the coin cell battery from the motherboard in case it is a corrupted BIOS that is the cause of the problem. If you haven't here's what to do.
Disconnect the power from the laptop and then open the laptop (you don't have to remove the battery as you said it's not there) and remove the coin cell battery from the motherboard.
Here's the [https://dl.dell.com/manuals/all-products/esuprt_laptop/esuprt_xps_laptop/xps-l502x_service%20manual_en-us.pdf|service manual] for the laptop. Go to p.37 to view the procedure to remove the coin cell battery from the board.
Once it has been removed, measure its voltage. If it is <2.5V DC or if the battery is >4-5 years old, replace it. The battery type is printed on the battery e.g. CR2032.
''Press and hold the Power button operated for a full 30 seconds and then release it.''
Reinsert the coin cell battery (+ve on top as marked on the battery), reassemble the laptop, connect the charger and check if it starts OK.
If it does there may be a message stating that the date and time are incorrect. This is normal as the BIOS has been reset back to factory default by the above procedure. Once the date and time have been corrected, the message won't appear the next time the laptop is started. Also any user definable BIOS settings, changed by you to suit whatever operating requirement you needed, will have to be changed back again also.