Husqvarna 50 Chainsaw - chain wont engage with...

Question

It's like the clutch isn't engaging when with throttle. The clutch looks like it is still ok. How can I test to see if it's engaging and if the clutch is engaging but I still don't have a turning chain what other issue might I have? Chain was working fine and then over about 10 minutes became less and less tension until once I try to engage the chain into wood the chain would stop though I had throttle.