You'll need to find out if your mic is a dynamic or condenser mic.
Look up the model & number on Google.
If it's a condenser, you'll need to provide power to it.
Usually phantom power is provided by the mixing board, but it could also be a separate power supply.
If it's a dynamic mic then you have another problem that's probably more due to a bad connection or the thing is just turned off. (sounds dumb but there's been many hours lost due to things not being plugged in right or forgetting to flip a switch on.)

Cardoid only describes where the mic pics up signals from.
In this case mostly from the front or top of the mic depending on the shape of the mic itself. (cardoids are best for live sound use to control feedback and for cases where you don't have really good sound isolation)
Omni Directional is all around the mic (used for getting the sound of the whole room)
Bi-directional is from the front and back and less from the sides. (usually used by a group of singers using one mic.