how can i tell if a favia is alive or dead?

i bought a pink favia about 2 weeks ago. it was one of my first corals i have ever bought. but i think it may be dying/dead.
is there an easy way to tell if their dead?
it's original color was a bright pink. but it has started to get a brown line down one of it's sides and it looks like a spike ball or is my baby dead? or is this normal?
i am able to post pictures...but the camera i have isn't that good, everytime i try to take a picture the lens can't focus :(
but good news is that the flesh on the coral has not began to receed