Pc randomly restarting when playing a game.

The title kinda says it. PC restarting when im gaming anything, league of legends, cod 6, borderlands 2 and probably more, i have not tried other ones.
PC just shuts down instantly whenever it feels like it and starts up again. Sometimes it happens 2mins after i launch the game sometimes 2hours in.

Asus P8Z68-V PRO/GEN3 Motherboard (Socket 1155, ATX, DDR3, USB 3.0, HDMI, Bluetooth Module
Intel Sandybridge i5-2500K Unlocked Core i5 Quad-Core Processor (3.30GHz, 6MB Cache, Socket 1155)
Corsair CMZ8GX3M2A1600C9 8GB 1600MHz CL9 DDR3 Vengeance Memory Two Module Kit
Samsung F3 HD103SJ 1TB internal Hard Drive SATAII 32MB Cache 7200RPM – OEM
Crucial CT128M4SSD2 128GB M4 SSD
Asus 1GB GeForce GTX 560TI DirectCUII PCI-E Graphics Card
LG BH10LS38.AUAR 10x Internal BD-RW Retail Kit
Logitech Wireless Combo MK520
Corsair CMPSU-850HX Professional Series 850W Power Supply

I put everything in because im totally lost.
I tried to reinstall windows, replaced the cpu and even the motherboard!
Still happening, tomorrow ill try RAM, Video Card, HDD's and what else is there ? (psu which i dont have, ive got only that one CMPSU-850)
can you help me out on this please , i dont want to spend all my days off shooting in the dark :D
4 answers Last reply
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  1. Sad to say, all I can think of is the psu might be bad. Im not positive it is the psu but that is what it is leaning towards. Although you might ought to go in and have a look at all of your connections and make sure they are all plugged in nice and tight.
  2. restarts when turning on game is a common side effect of a psu failure. or the psu unable to power some object.
  3. thank you very much, ill try to get a psu from somewhere so i can check it out, but first ill try to redo all the connections.
  4. thanks guys, you were right. I changed the psu and now its working fine
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