PC shuts down when playing any game.

Hello,
my PC's specs are:
-GTX 560 1GB GDDR5
-i5 2300 quadcore going at about 2.8ghz
-6gb of ddr3 RAM (some Kingston brand, cant remember)
-700w Cooler Master Silent Pro series PSU
all my drivers are up to date, and i'm pretty sure this PC can handle Skyrim, RAGE, League of Legends, etc. at pretty high settings since my old GT240 could handle all of these perfectly (medium settings with 40-60fps). my GPU's temperature never goes above 60-65 degrees (when playing games) since my room is ass biting cold, and my CPU stays within 40degrees all the time. i know my PC could handle these games, but i usually get to play for about 5-10 minutes until my PC completely shuts down.

any idea why this is happening?

is it shutting down or rebooting? big difference between the two.

if it's shutting down the only thing you have to check is your PSU

if it's rebooting, go to system settings, start up and recovery, error reporting, uncheck "reboot on critical failure" and see what happens. if you're getting a BSOD it's either a hardware issue with one of the components or driver conflict.

while you're playing for 5-10 minutes, is the fps stable? no stuttering of any sort?
does windows crash if you're not gaming?

check the temperature, check that fan is working, check that it's plugged in properly etc.

hard shutdown is happening to prevent damage or PSU not being able to supply enough power for the whole rig to run.

typically, these run for 5-10 mins and then shutdown problems are thermal issues, since they don't present themselves during normal windows operation. Since you say your GPU and CPU are well below 85C it's clear that those are not the cause for shut downs. Check any other temps you can get to (hardware has thermal diodes) usually a mobo has a thermal diode around the CPU package or around ram. HDDs occasionally have a thermal diode too. PSU might have a dedicated, but for it to report that to mobo you would have to connect it by a separate wire.

if this is all new parts, open your computer up and check that everything is seated properly. feel the components if they are hot or not. etc. check for bulging capacitors on mobo (although those usually present much more severe malfunctions)

my whole rig is as cool as can be. i can play League of Legends for long periods of time now with no problem, tried playing RAGE. played for about 5 minutes, paused cause i had to answer phone for about another 5 minutes, came back and PC shut down about 5 minutes later. 15 minutes total of gameplay yay . anyways, i've checked the temperatures of just about everything and everything is cool, can it be driver related or something?

Mine shuts down while playing games as well Mainly it shuts down on Battlefeild 3 but the weird thing is i can play MW2 and MW3 and Rage Crysis 2 ETC for ages but after 30 mins on battefeild it shuts down

My Specs

CPU - AMD 960t @ 3.2
MOBO - MSI 870a G-46
RAM - 8GB Cosair Vengence 1600 MHz
GPU - Crossfire XFX 6870's 1GB @ 900/1050
PSU - G7 Extreme 850w Modular
SSD - OCZ 60GB Vertex Plus
HDD - WD Blue 500GB 7200RPm

i think it might be the power supply because its not a decent named brand like Corsair or Antec but i would like to get some feedback first
My tempatures are low BTW CPU Full Load is @ 38C and the GFX is @ 60 below

but to note on battlefeild only one of my GFX are beeing used GPU1 60 - 90 Usage and GPU2 doesnt even budge past 10 Usage

all the latest drivers are intalled to add

What would u reccomend i was looking at the TX 850 or the HX 850 im looking towards the HX 850 mainly because its modular and i like my pc to be tidy for airflow reasons plus its a waste of cable managment in my Antec 900 V2

I am having the same problem and it happens with every game. I downloaded Mario with a portal gun and it did even with that game. I can play games in a browser and it doesn't shut down. I have been playing portal 2 and Fallout New Vegas for a longtime and it never did this before. About 30 minutes into the game it shuts down. All my drivers are fine. IDK what the problem it. IT really makes absolutely no sense why everything else functions normally but the game

O and it is not ram not graphics and drivers are fine. I just need to do one more thing to rule out all the basics and that is virus scan.