First, be sure the lock is being powered by a DC source and that polarity is correct (RED to positive DC BLACK to negative DC). If the Magnalock is wired in reverse polarity, it won't be damaged, but it will not operate.
Second, if the unit continues to appear dead, it must be electrically checked with an Ammeter. It must be powered with the correct input voltage and checked to see if it draws the specified current. If the unit meters correctly, then the magnet body is operating properly and the problem must lie in the mounting of the strike.