Sounds like the nand youre booting is messed up to me, although i cant be 100% certain.Tried both approaches mentioned in the "Alternate boot setups" section of the NH Switch Guide (nh-server)
1. Adding fusee-primary.bin in bootloader, modifying hekate_ipl.ini, pushing the Hekate payload and selecting Launch -> Atmosphere. Result is black screen after both the Hekate and Atmosphere logo.
2. Pushing the fusee-primary.bin payload. Result is black screen after the Atmosphere logo.