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one solution -- reinstall the CD recovery to factory default settings
go to START, in bottom START SEARCH, type in recovery --- go to that part of the software and format the drive , reinstall and set to factory default -- back up any data you need first before taking this approach
if this helps , leave me positive feedback please.
Don't worry. It could be that the sound drivers are not instaled. Simply download the drivers from support.dell.com by entering the service tag. The sound should be back. The battery has nothing to do with sound. From the same website, install the BIOS update. That shoule get the battery message go away. Incase that does not happen, then you may have to buy a battery. The batteries have 1 year of warranty from the date of invoice.
I work in DELL, so please try what I ahve mentioned and you should be happy!!! If not, post a message.