Hi there!
So, the blue light does not comes up at all?
Maybe silly question, but you already tried a new battery, right?
If yes, then you need to check the motherboard. Check the fuses first. They are labeled with "F".
Here is the part, including a photo where the fuses are located on the motherboard: https://www.aliexpress.us/item/3256803225310401.html?gatewayAdapt=glo2usa4itemAdapt
Please let us know how it goes!