im scared and i cant tell whats going on! please help

My tortoise has a clean happy home and a very large cage recently he went to "hibernate"and since then i check on him daily... The other day I checked on him I picked him up and he was cold and his skin had a greenish hue. I got very worried and I cant afford a vet at the moment this is my first tortoise and i cant tell if its...dead.... or just sleeping i am sick with worry and nobody seems to know which it is... I dont want to put him in a grave or anything until i know for sure if he is dead, for reasons involving being burried alive. pleas help me.