Issues regardding my uncle blue ray

As of last night my ucnle blue ray is refusing to read blue ray or standard DVD's, the error is that the format is incompatible or the disc cant be read, oddly it was working fine but suddendly stoped,any ideas?

Maybe the lazer is broken

Replying to #2

i think i will leave that posibility as last, since the blue ray hasnt been used much maybe six times counting the weekend marathon we submited it trough, what else could cause it? dirty lens? and how frail is the laser of a blue ray?