got new circuit board but no hash board are detected

[oscartheprofessor]

hey everyone
after getting a new circuit board for my antminer l3+ after install it no hash board are detected...
the blissz firmaware was installed for a d 3 miner i think....
even after flashing it with the rigth firmware no hash board are visible.
so i put back my old one and now not even this one is detecing any of my cards ....
im so lost....
can the new circuit board have mess up my hash boards
really dont know what do to cause i already did both way of flashing it ...
please let me know