Your generic 2 digit test card is like using a generic OBDII reader on your vehicle. It may indicate a fault, but cannot give you the manufacturers specific DTC or "P" code specific for the vehicle. If you have stripped the board down, tested each component and still receive an error or no boot situation, then a component has likely failed.
You system specs would normally include all connected components and peripherals, rev of your board and BIOS revision you are using. This saves people from having to visit the E2100N webpage only to learn there is one rev of the board, one BIOS revision and limited memory options (only 1333Mhz) supported.
At this point, I would attempt CLR_CMOS and see if this helps. If not, I would attempt to invoke boot from the back up BIOS. If that fails, and you have verified the function of the other devices, the board has failed.