And it took you three years to create an account to ask for help?
So... Does not turn on as in "The blue LED lights up shortly and fades off again"
? That is B9S (or when even older A9LH) not finding a valid boot file.
For that case:
Take an empty, FAT32 formatted and tested (use h2testw or F3) SD card and provide the following:
- Latest Luma3DS boot.firm from the archive here.
- In case that does not work try boot.firm from v7.1
- Lastly try arm9loaderhax.bin from v7.0.5
For the case non of these do anything: Make sure the console SD isn't dirty or defective and try the same files on other FAT32 formatted SDs as well.
If I understood does not turn on completely wrong, please provide additional information.