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Sometime a sound come from my computer?

\015 Sometime a sound come from my computer it is like siren today is about for 15-20 second but yesterday it is 30-35 second .i am hear this sound first time. is cpu produce this type of sound i am confuse please help me?\015

Answers :

If the sound is happening right at power on, then it's coming from the motherboard's POST testing. Considering it stops, the most likely cause is a fan that is starting slower than normal (wearing out), and is falling below the speed threshold set in the BIOS configuration.
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