Do you have your volume on LOUD? I know you've gone to the system settings to turn them up, but sometimes, and I do this way too often, I turn my sound down with the volume control on the side.
Let me know if this helps you, if not then PM me or write back and we can further look in to the issue.
Now, now, children. Let's BEHAVE.
If someone has helped you, then hit the THANKS! if it needs a MODS attention, hit !REPORT