I have notebook LM50a, when my notebook was turn on suddenly it's turn off and when I turned on again my notebook, I smell bad smoke from my notebook. when this problem happend no any device attach to my notbook ports and then my USB ports did not work at all. This Problem has happened for second time. this problem happened for my previous notebook (exactly same model LM50a) last year
I couldn't tell you exactly the problem, but the fact that your smelling smoke isn't good at all. Would sound like there is an overheating or shorting problem. If it is still under warranty I would send it back and possibly think about going with another model.