Chosen Solution

i press power, and the blue led turns on 1 second, then goes off, and the console doesn’t start, help please.

You’ll need the boot.firm file on the root of the sd card. Specifically this boot.firm, since the latest boot.firm won’t work with your softmod.

did you softmod the 2ds recently?

Remove the SD and reformat it to FAT32 that’ll fix the issue.

It is probably the battery. Mat need to clean it or change it