Text Explosion In Blender

Hey guys, So i am pretty new in blender & still learing stuff…So after watching a couple of tutorials about explosions in youtube I decided to create a text eplosions myself…and everything works great except the smoke doesnt render…when I try to render the project in Cycles or in Blender render its just a black or gray screen…I have tried many solutons but nothing works out…

Can someone take a look at this and give me a solution…I am also uploading a couple of images here so you guys would know whats the problem exactly…