AT3-710 EB52 sudenly shut down after working for 2-3 hours, won't boot up again, led logo flickers

So, here's my story, I've bought this from a gamer friend who's using something more "pro", it's an AT3-710 EB52 except the GPU has been replaced by an NVIDIA GX960.

I've brought it home, installed everything, logged in, and had the time to install a few things on it (2-3 hours max), then suddenly, power turns off and I can't reboot at all, all i'm getting is this flicker of the ACER logo in front when I press the on/off button.

Already tried a few basic things, differents power cables/outlets and opening replacing ram and stuff.

My first guess is that it's the power supply who cannot take the NVIDIA, but after doing the calculations I find it a bit unlikely.

My second guess is that it might be the power cable (which I had to provide myself, I only bought the computer), can anybody confirm to me that this might be the issue,something like a problem of matching the power cable Watts with the power supply entry ? (I'm in canada so it's 115 watt input).

Anyway, I'd like to know if anyone had prior issue such as this and found a way out ?

Cheers

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doughjohn

Hi

Well put back the original part.

Ask your friend if they replaced it because it was problematic, they may not say, otherwise ask them for help.

I assume the supply is 115 VOLTS in Canada.

If you replace the GPU and all is well then maybe the NVIDIA is too power hungry and a new power supply or cable is the answer. If not then remove the HDD and try again.