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My Acer Aspire 5742 developed a screaming high pitched buzz. This happens even when it is not connected to the net, or even when there is no dongle attached. This has developed since we used a Virgin Mobile Wifi stand alone device. It has never happened before, and Ive used Orange, 3, and Vodafone Dongles. The laptop is only 6 weeks old. Have adjusted all sound, microphone settings, but still have the same problems. Can you help Thank you Christine

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High pitch buzz is usually caused by the system fan but can also be caused by the optical drive and the harddrive. check if the system is getting hot. try cleaning the vents of the system. verify that there is no disc inside the optical drive. try booting to safemode and check if the system will still caused the noise. also run a hardware diagnostic to check the fan and harddrive.

Posted on Mar 27, 2011

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Posted on Jan 02, 2017

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Got here as quick as I could.............just a minute, I'm out of breath!

Whew!


Acer Aspire 5742-6439 product review,

http://techwiki.hardwarecanucks.com/product/2MTExNTc4NQ/Acer-Aspire-AS5742-6439-Notebook/#pics

For specifications in case you need them.

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http://www.laptopguides.info/acer/acer-aspire-5742-service-manual/

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It works, I'm looking at the Service Manual right now.

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[ The above is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.

After you click on the file name ( Acer Aspire 5743 Service Manual), it may take up to 30 seconds, before the first page comes up ]

Not what you had in mind?

User Guide,

http://support.acer.com/us/en/product/default.aspx?tab=1&modelId=3277

Now, may I ask what the problem is? Post back in a Comment.

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