Are they safe to eat?

My power went out today for 4 hours. 30 minutes after it went out, I put my milk, baby's yogurt and lunch meat in the freezer. When the power came back on, I put everything back in the fridge. I also had some frozen chicken and beef thawing in the bottom of my fridge before the power went out. Does anyone know if the stuff is safe to eat, or should I just throw everything away?