doesn't work, need to know if it's fixable

doesn't turn on when not connected to the PC, when connected will make a really low tone(& volume) beeeeeeeeeeeeee... and the tone will shift when the power button is pressed - and will shift back when the PB is released. *doesn't work* . suddenly stopped working , no thing else is faulty

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How are the battery pins? Still good? Sound like something on the motherboard just died (small component, like a cap or something). Please check them. Also if possible, please share some pictures with us.

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