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Loud buzzing noise VN7-791G [+ audio clip]

laptop is new; used less than 2 weeks.

 

as usual i had 4 or 5 tabs open on firefox, one of them streaming music

 

i wasn't at that time "using" the laptop; i suddenly heard a loud, abrasive, buzzing sound

looked at the screen - it had gone dark

 

it didn't respond, so i forced shut it.

 

when i restarted it, it worked without any hitches.

 

i am concerned about that loud buzz - there was no heavy programs running on the laptop.

i don't play games. just web browsing, writing, & streaming music.

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