My computer keeps turning on and off

My computer just randomly keeps turning itself off, normally its when I play games but occasionally not. At first I thought It was overheating so I installed some monitoring software and It was no overheating. I have checked to see that everything is plugged in properly and secure and everything is. I'm stuck and I have ran out of ideas on what to do. Please help I think it may be something to do with the CPU or PSU any ideas will be greatly appreciated. Also sometimes this incident wont happen for weeks but when it does happen my computer ends in a continous reboot.
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  1. What are your system specs? It might sound like your power supply is struggling to keep up with what your system demands. That would also explain why it happens during gaming sessions, I suppose.
  2. RAM - G-Skill 8GB (2x4GB) DDR3 1600Mhz RipjawsX Memory Kit CL9 (9-9-9-24) 1.5V

    CPU - Intel Core i3 2120 3.3GHz Socket 1155 3MB L3 Cache Retail Boxed Processor

    Motherboard - Gigabyte GA-Z77-D3H Socket 1155 VGA DVI HDMI 8 Channel Audio ATX Motherboard

    GPU - Gigabyte GTX 650 1GB GDDR5 VGA Dual DVI HDMI PCI-E Graphics Card

    Hard drive - Seagate 1TB Barracuda 3.5" SATA-III Hard Drive - 7200RPM 64MB Cache

    PSU - Xenta 600W 12cm Fan PSU - 1x 6pin PCI-E 2x SATA

    Optical drive - Samsung SH-222BB 22x DVD±RW DL & RAM SATA Optical Drive - OEM Black

    SSD - OCZ 128GB Agility 4 SATA III SSD
  3. It seems that it is most likley your psu, people have had similar problems with that psu.
  4. I would bet on the PSU. Next time it shuts down if you can open the case and put your hand near the PSU (Don't touch!) you may be able to feel the heat coming off on it. I had a problem like this a while back.
  5. Probably the PSU; that fact I've never heard of the brand is probably a good indication its a crap PSU. [Worse case, its not even capable of outputting the 600W its claimed to be able to output].
  6. Alright thanks guys ill check next time it turns off.
  7. Ok, So from all your answers I've come to the conclusion that I'm going to need to buy a PSU. What kind of power output do I need to run my computer?
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