If you havent already. Get ANY lamp bulb in there asap. Your chicks are dying from cold. Also water will wick onto pine shavings, and get water everywhere. One reason i dont use them. If your chicks touch their water at all, they will wick it up as well. Without heat to warm back up, its a fast death sentence. Your last remaining chicks wont make it through another day without immediately installing a heat source. After being cold for so long they may continue to die off because they havent been digesting food due to cold.