PC Turns Off Randomly

themeefer

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Jun 21, 2014
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Recently, my PC has begun shutting down without notice and when I attempt to restart either the fans will turn on, mobo and GPU light will come on before shutting down again or a blue light will flash on the mobo beside the PCI slot. Eventually it will boot after at least 10 minutes and a lot of effort.

Initially I thought it was an overheating issue, as it was only happening while playing CS:GO/games. So I tested CPU, GPU and mobo temps, CPU was hot asf (was using stock Intel cooler because previous cooler broke) so I got a new one. Thought this had fixed it but no. Now it has started Turing off even when just on the Internet and under little stress.

Had a similar issue on a previous build with some of the same components, (PSU, RAM and drives)

Components:
CPU: Intel i7 4790K
GPU: EVGA Nvidia GTX780TI Superclocked
Mobo: MSI Z97M Gaming
PSU: Corsair AX850
Case: Corsair 350D
RAM: 16gb Corsair Vengeance 1600mhz

Any help is much appreciated, sorry if I forgot stuff.

Edit: Just adding that the system had been working for months with no issue until now.
 
Solution
I would think about overheating too. I am having the same problem on a gaming laptop and without playing games. If I watch long flash videos, unexpected shutdown, especially on a hot day (somehow ambient room temperature adds to overheating issue)! My problem has happened a lot since Qosmio's March 2014 BIOS firmware update. When i touch the back of my laptop, near where the GPU is, it's really hot. So I have to wait a good 10-20 minutes or unplug everything + battery and lay the laptop on the air-conditioning unit.

From my experience with other laptops, I need to
(1) Use an air-duster canister to completely clean the mobo and fans of all dust.
(2) Re-do thermal pasting on everything and by that I mean do it properly. Clean, let it...

Natasha26

Distinguished
Jun 11, 2008
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18,520
I would think about overheating too. I am having the same problem on a gaming laptop and without playing games. If I watch long flash videos, unexpected shutdown, especially on a hot day (somehow ambient room temperature adds to overheating issue)! My problem has happened a lot since Qosmio's March 2014 BIOS firmware update. When i touch the back of my laptop, near where the GPU is, it's really hot. So I have to wait a good 10-20 minutes or unplug everything + battery and lay the laptop on the air-conditioning unit.

From my experience with other laptops, I need to
(1) Use an air-duster canister to completely clean the mobo and fans of all dust.
(2) Re-do thermal pasting on everything and by that I mean do it properly. Clean, let it dry, apply paste, let it dry and then use moderately for first week.

If all fails, I might do a clean re-install of Windows (maybe get Win10 which I'm not too keen on) or downgrade the BIOS if that's even possible.
 
Solution

themeefer

Reputable
Jun 21, 2014
3
0
4,510


RAM is 2x8gb

I think you might be right about the PSU, I'm gonna try to get that tested today. Surprising tho as they are meant to be so good :/