Answer:
Inner membrane of the mitochondria helps in the electron transport chain and ATP production. So, any damage to inner membrane hamper electron transport chain and ATP production, the consequence is as following:
In the process of the electron transport chain, protons are pumped from the mitochondrial matrix to the intermembrane space, and then the oxygen is reduced to form water. The inner mitochondrial membrane is semipermeable and allow selective ions to enter into mitochondria. This selective permeability maintains the proton (H+) gradient that helps power the ATP energy formation and energy derived for electron transport chain.
So, if inner membrane of the mitochondria will get damage and become fully permeable to all solutes, the proton (H+) gradient will not be maintained and not ATP formation and electron transport chain takes place.