Hi normaly on this laptop on starting your laptop you must press and hold f2 or del this will send you into you sys bios settings when your in goto the end this is when your exiting the bios in this you will find a option saying restore best working defaults scroll down and enter this then save on exit yes this will restore all the original setting ok
hope this helps ok thanks
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First check in BIOS whether the BIOS itself is identifying the battery.Behind the battry there is a health check meter which will tell the current health of the battery which will tell you whether it is time to replace the battery.
also try reinstalling the ACPI chipset driver.
what i would suggest is to check the bios there may be a new flash download on the dell website, my wife has a inspiron 1525, which is plugged in and says not charging, the battery will not go above 0%, but we have had to send it to dell (still under warranty) faulty motherboard. if the bios is up to date, there could be a hardware issue with the battery or motherboard
If you are not afraid to open the box, the simple fix would be to remove the cpu battery(looks like a quarter) for about 30 seconds and replace, then boot up. At that point it will ask for information such as date and time, but then you can access the bios
click on this URL and before any steps are done please save your work and also check in BIOS battery charge should be more than 10% in BIOS and Ac Adapter should be connected and make sure that there should be no power failure during this process.
After the BIOS update try to update the sound driver on the link mentioned above.Even after both the updates don't give results call Dell Tech Support and based on the HW warranty get the motherboard replaced.
Also try and connect to external speaker and see if the issue is same or different??