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First thing I'd check is for a BIOS update for your computer under the Acer support pages (acer.com). In some cases, thermal control updates are included in newer version of the BIOS, if it is a manufacturing problem.
Goto http://www.cpuid.com/hwmonitor.php and download Hardware Monitor, start the computer and immediately run the hardware monitor app to check how high the temperature on the CPU gets before it shuts down.
Continuing use under this condition may damage your Windows installation because of the sudden shutdown.
When was the last time your system was cleaned? Physical debris and dust accumulates in the vents of the internal fans of some of the laptops we repair. The overheating will cause the laptops to shut down withing minutes (seconds sometimes) of turning on the system.
In most cases I have found that this problem stems from a bad charger not delivering the proper amount of voltage. Therefore the battery doesn't ever really get a full charge even though the power indicator may say it does. I would get a multi-meter and check the voltage at the charger tip and see if the power is fluctuating. Be careful regardless, a bad power unit may spike and terminate your motherboard.
Please go through the following link and download all the drivers of audio then you will be able tro hear the sound again. In product family select notebook and then aspire then aspire 3690 and then the necessary driver: