Shut Down While Using

Asus FX504GM So I've had this laptop not even 8 months and it's already started to overheat. I've done everything from getting a cooling pad and putting another fan underneath the cooling pad. To underclocking my GPU which overheated the most. Today while playing borderlands 3, my PC shut down...

I've seen this kind of problem mentioned a couple of times, but I have no idea how to do any of the suggested solutions as the 1/2 second or so that the power light is on offers me no option to access anything. I was typing away on a document when it just shut itself off. I thought it was a Win...