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First check the settings under Sound Settings of the Realtek HD sound Manager. If everything looks ok and it works with external microphone, then the problem could be Hardware problem which won't be fixed unless the motherboard is replaced.
In the meantime, I would also suggest you to uninstall and re-install the sound driver. By the way, what's the operating system installed on your laptop?.. Hope this helps.
A corrupted or missing audio driver can cause this problem. You can try to do a System restore back to the earliest date that it worked fine. If this doesn't help, you need to check out Dell website and download the audio driver compatible for your laptop model and operating system version.
I hope this helps, please inform me if this resolves your problem or not to check for other resolution that we could try. Thank you.
Your best bet is to use System Restore. Boot your system to Safe Mode (press F8 repeatedly). Go to System Restore and choose a date when your system worked OK, before the virus. Note: with System Restore, everything, including your documents and other files you saved on the hard drive, will roll back to that date. If you have updated your documents, etc. recently, back up those documents, first.
go to control panel. using classic view, choose sound and audio device. from the dialog check whether the system speaker it in mute state. If its not in mute state. There is another option, u restore ur system back . click start, run, type restore in the space, enter, double click on the restore icon, it wil open the restoring points you have on your system. choose the date that u know that all the drivers are working well, then ok. Your system will restart. Thats all very simple.
Try using head phones to see if you get sound. If you get sound ur speakers on the laptop are blown, if not it might be the sound circuit. You should check Device Manager to see if ur sound card is showing up or if there is an error on it. If its blown you might not find any sound device or it might be highlighted with an error