Is it a switcher that has a relay contact output?
or is it a solid state device?
Plus all the previous questions.
The following are possibilities from the information given so far -
1 The unit is broken
2 The lamp circuit is broken
3 The unit requires that the lamps be connected with a negative behind them but has a positive
4 The unit requires that the lamps be connected with a positive behind them but has a negative
5 The lamps may be sensitive to which way round they are connected
6 The unit may be sensitive to the polarity of the load
7 The unit may have been overloaded
In the cases of 3-6, either the lamp circuit or the unit may have failed due to incorrect connection. In the case of 7 the unit may have failed due to overload
8 If the unit is not plugged into the channel associated with the expected TX control, it won't work.
Any one of the above will prevent it working, some until the mistake is corrected, some until the broken bit is replaced, depending. If more than one applies, it just makes it trickier to find. A careful read of the instructions usually helps.