@ khaahk @m1ch43lzm​ Thank you very much for the response!!

Hi! After I reprogram the BIOS, the Laptop successfully lunched. But now I faced with problem to boot Windows from SSD. The Bitlocker asks the recovery key to unlock the system. I programmed the BIOS with dumb which I downloaded from internet and didn’t change it (didn’t change the motherboard serial number or other data), so I believe that Bitlockers thinks that the motherboard was changed. And the owner of the laptop doesn’t have a Bitlocker key and doesn’t have access to Microsoft account where she can get this key. Is it any way to change motherboard’s serial number in BIOS from...

Hello everyone,
I need your advice in diagnosing a motherboard issue on a Lenovo IdeaPad 3 15ITL05, motherboard HS45A/HS55A Rev 1.0 NM-D461 (2020-11-02).
Symptoms:
The laptop does not power on and does not respond to the power button.
Background:
According to the owner, her child was playing on the laptop when it suddenly shut down.
What has been done so far:
Original charger is missing; the non-original one was tested and found faulty (0 V output).
Using a lab power supply (20 V, 0.5 A) — no activity on the board, no LEDs, no standby voltages....