My computer shuts down when ever i start play games

this is a new problem for my pc !! games used to work very good but then this problem started to happen my pc has intel core 2 quad and a 1 gb ddr5 sapphire 6770 and gigabyte p45 motherboard and 350w hec power supply i think the problem is because the power supply because after 3 years it may be having lower efficiency or maybe the vga card it a new 1 got it from feb 2012 but it was working very good !! till this started to happen !
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  1. I would upgrade the power supply to a good one. A 500 watt would be plenty with room to spare, Corsair, Seasonic, Antec are good brands. If you want to do some research on power supplies go to ( hardwaresecretes.com) and click on power.
  2. For a system using a single Radeon HD 6770 graphics card AMD specifies a minimum of a 450 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 23 Amps or greater and have at least one 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated @ 45°C-50°C ambient temperature, is the most critical factor.

    HEC 350W power supplies usually have a combined +12 Volt maximum continuous current rating of 23 Amps. HEC power supplies are not tolerant of being stressed near their limit especially the lower end series.

    Antec NEO ECO 400C 400W for $39.99
    +12V@30A
    1 x 6-Pin PCI-Express Connector
    OEM: Seasonic
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371029

    CORSAIR Builder Series CX430 430W for $36.99 ($16.99 after $20.00 rebate card)
    +12V@32A
    1 x (6+2)-Pin PCI-Express Connector
    OEM: CWT (Channel Well Technology)
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026
  3. Before you do anything else, What are your CPU Idle and Load Temperature ?

    Basically Temperatures when gaming and also when you first turn on the PC with normal everyday browsing.
  4. all the temperatures are good i installed the 450w antec and everything is good now and working thank you all :)
  5. Always good to hear issues have been resolved and thanks so much for posting back to let us know.
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