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Mavericks sound, bootloader and network problem

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I have a problem with my built-in microphone (laptop) it keeps turning on on maximum volume even if i turn off my microphone.

So when I put my laptop screen down I immediately get annoying audio feedback.

And the bootloader gives gpt0 error so every time i have to boot from the usb and select "Mavericks HD".

And my network card doesn't do anything either.


My specifications are:

Laptop Acer Aspire E1 571

intel core i3

intel hd 3000


Running OSX Mavericks 10.9.0

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