Sound not working

here are list of things you could do:

1. Go to control panel and check your sound devices or sound controller. The icon should look like a speaker, check if it has any conflicts or if it is even available. If not, then you need to find out what driver software does your audio hardware is compatible with. You can find drivers at www.driverscollection.com download the driver that matches with the description of your audio hardware and install it.
Im not sure if this program will help, but you could also use a software called everest free edition. Google it and download it to check your computer hardware specs.

2. Check you mini plug cable connection if they are inserted properly or damaged and also check your speaker if its blown/busted or not.

3. Defrag your computer sometimes there could be a delay on the HHD(hard disk drive) due to too much fragmented files.