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Users here should be able to help with your problem.

Step 1 should be to reinsatll Audio drivers 

If you have already done it.: Dell machines are mostly dependent on Realtek Driver and WaveMaxx to function internal speakers and headphones

1. In Task manager > startup . Make sure WaveMAxx and Realtek are Enabled 

2 RUN > MSCONFIG > Services . Waves Audio and Realtek both should be checked 

Reboot and everything should work fine 

Thanks very much, would you please walk me through how to enable them because I can't see i

Open Task manager , Click on Start up Tab 

You should see WaveMaxx Audio , Right click and choose enable and reboot. 

If WaveMaxx is not there than required driver is missing reinstall Audio Driver. 

I looked at Support Site and there are no Drivers for Windows 10 

Try Realtek Website for drivers.