Dying laptop - second opinion needed.

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After many hours of playing DOOM (2016) on a hard wooden surface (moderately ventilated), my hard drive started ticking. Laptop did a chkdsk on startup and got stuck at 73%. Repairman said hard drive failure probably due to overheating. I ordered an SSD instead and will get a cooling mat. I'm currently running of the primary SSD already in my laptop (it had an SSD and 1TB HDD). I haven't been gaming with it at all since then. I was using google maps and going into street view, with my laptop on a hard wooden desk in a well vented area, for many hours on end, and there were minor graphical issues on street view like it just going black, or not loading properly (despite it being an incredible graphics card), etc, and occasionally the laptop would instantly go into sleep mode. Eventually, it would stay in sleep mode and only turn on for a few seconds before going back. It only felt mildly warm. Called the guy and he said it's probably some kind of voltage error that is causing the graphics card to overheat, which also killed the hard drive, and that I should take it in to him asap.

So that's the entire story is as much detail as possible.

Specs:
Asus ROG GL752VW
Windows 10 Home 64-bit
Intel i7-6700HQ ~2.6GHz, 8 cores
16GB RAM
GeForce GTX 960M ~12GB
Intel HD Graphics 530 ~8GB
DX12

I've had it since mid summer.

What does /adv/ think? Is he on the money? Could there be another source? How fucked am I? It's a really fucking expensive laptop and I don't have insurance so I'm hoping to god it's fixable. I just want a second opinion.