hello, Gathering info...
Mobo : ASUS M5A99FX PRO R2.0 AM3+ AMD 990FX + SB950 SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS ?
Operating system ?
go into the audio control panel and make sure that you have selected the right output for your listening device.
Make sure the levels in the panel are turned up.
If that is not the problem, you may want to follow the sets below :
What I do when sound gets messed up do :
get myself ccleaner : [url]https://www.piriform.com/ccleaner[/url] This is cool tool that looks for registry inconsistencies.
Go to the ASUS website, find my motherboard and download the right drive software.
installing anything, go to the add/remove programs and uninstall the realtek drivers.
Do not reboot !
run the ccleaner registry cleaner, if it finds anything click "fix selected" it will pop upa box to save the registry, i usually say no, ccleaner will deleted them from the registry.
run ccleaner registry again.
If finds something , repeat
run the cleaner when it find 0 issues.
i will get pop ups "found new device blah" that is fine.
Install your realtek drivers...... done
run ccleaner on last time to check for any new registry errors.