Clippers Stopped Cutting

Hi All!

I have an issue with my clippers. I was mid shave and the sound of the clippers reduced and then they seemed to stop working. I've de-clogged the hair as much as possible off the plastic attachment and the blade and even took the blade off and it seems to be ok as far as clogging goes. I haven't oiled yet. Trying that next.

Anyone any ideas what may have gone wrong?

Thanks!