Why didn't my cake rise ?'

Check the expiry date on baking powder, soda and flour. Baking is very scientific so you have to also be very careful to weight ingredients and not guess at volumes.

Is your baking soda or powder expired? Is your oven thermometer too hot?

Could you post the recipe or a link to it? It's hard to even guess without knowing how the cake was *supposed* to rise (chemical leavening like baking powder, beaten eggs or egg whites, yeast)?