Laptop suddenly shutdown

Help,my laptop suddenly turned off for no reason(that's what I thought,cuz im not good with notebooks or pc's).Im using acer aspire model v5-471.Its old and the battery was damaged so I unplugged it.This morning when I were reading novels,this guy suddenly died.My mistake was that I left it running before I went to sleep(im really sleepy though)yesterday.My biggest guess is it was overheating through the night.

Apologies for the bad english if I can't hinting you guys what i'm trying to tell,and from deep down my heart,im really grateful to you guys for solving my problem.