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When I play Publishing Clearing House Slots, eventually my Norton advises me that my CPU usage is running high. I know nothing about computer temperatures. I'm I at risk for damaging my computer? Thank you for your help with this.

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Does the fan speed up when this happens? IF so, you're probably fine. –  Kruug May 8 '13 at 18:03
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Usage, no, but temperature, yes, definitely. Install a tool like Speedfan or CoreTemp to monitor your CPU temperature. You can find the safe ranges for your CPU by looking up the model number, but most are getting into the danger zone at about 72°C.

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This. Monitoring CPU usage to detect potential problems is completely useless. –  Dennis May 8 '13 at 19:06
    
indeed. with appropriate cooling, there is no reason it should not be able to run at 100% for its entire expected lifetime. I'm sure at some point the extra entropy from the constant voltage (and fluctuations thereof) will put some wear on it, but like everything else in the universe, its continually dying. –  Frank Thomas May 8 '13 at 20:06
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