keyframe problem

Hi guys,

I have a little problem here. I'm very green in Maya so maybe it's something quite simple to do.

Here it is : I've created an animation using keyframes in Maya. I started messing around, trying stuff. But now how can I delete all animations and restart from scratches. I've even copy/paste the model in another scene, but the animation follows.

I've deleted the keyframe in the timeline but the things keep moving. It must be a way to roll back. btw I've overwrite the original scene with the messed one.

any thoughs ?