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Power supply makes weird electric noise and annouce PC failure .

Last response: in Components
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Hello,i have a question which is related to power supply .Im using windows 7,but lately my computer psu starts to make electrical buzz like 20 times in 3 minutes .And that sound announce computer is about to restart/shut down.Can i fix that somehow .
PS . I did disabled automatic restart when i get error, and i did change cables and plug them in different electric sources in house .Thanks for all replies .PLz heelp
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