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Windows 7 random freeze and buzzing sound

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Does anyone know how to fix this problem?

While i was playing game/watching movie/ playing song, the laptop randomly freeze and buzz for 1-3sec and everything back to normal again.

Some times it happen few times in an hour.

I did a memtest86 on the ram for few hours, results shows fine. Did a hd tune test, results look ok too.

Dell inspiron N5110

intel i7 @ 2ghz

6gb ram

500gb hdd

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