Computer Shutting Down without warning?

[Joseph]

You need a much better power supply, is what it looks like. The 450watt power supply would be the bare minimum for your system using that graphics card, but considering you are using an i7 3770k CPU, you need more watts. I would recommend you switch it out for a 600 watt bronze rated power supply just to keep your system as it is with enough power. Otherwise I would recommend you up the power supply to 750 watts so that you can run a better graphics card in the future.

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