Ps4 won't turn on

First time I faced problems is during a game the PlayStation suddenly turned off. I waited like 5 mins and then turned it on again, and then it said PlayStation is overheating. Then I got my mum to phone Sony and they said it must be a problem to do with the dust. So then I removed the dust from the vents, but it still didn't do anything and the PlayStation would turn off randomly. After I didn't really play on the PlayStation, mainly because it was the year 10 mocks. I played again after mocks finished and it was working well for about 2 months and suddenly the PlayStation turned off and It never turned on again.