Hi Md. Shamsul Arefin_056,
Thank you for reaching Microsoft Community and I'm sorry to hear that your Surface Book 2 is not turning on.
Please try first to disconnect all extra peripherals from the device including SD cards and USB drives then connect the charger and confirm that the tip is lit. Once done, perform a force shutdown on the device by pressing and holding down the power button for 20 seconds. After releasing the power button, wait for around 10 seconds then tap the power button again and see if the Surface turns on.
If in case the Surface turns on, please proceed in checking the Surface drivers' health through the Surface app then run the Surface Diagnostic Toolkit as this would also run some checks on the device including updates. See: Fix common Surface problems using the Surface app and Surface Diagnostic Toolkit - Microsoft Support. After running the tool, check again for Windows Updates in Windows Settings > Updates & Security to make sure that all updates are installed including Optional updates then check if the issues with the battery and fan persists.
Let me know how it goes.
Kind regards,
Marrion