Hi AlejandroB,
There are some recommendations I can provide for you:
1. Make sure you have updated the bios and drivers using the latest ones from our web site.
https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&keyword=DH87MC
- Make sure the devices are correctly connected and installed.
- I recommend you resetting the bios to default settings by accessing in it with F2 and when in the bios, press F9.
- I recommend you Clearing the CMOS on the motherboard.
You can also check some more instructions at the following link:
http://www.intel.com/support/motherboards/desktop/sb/CS-034208.htm?wapkw=no+audio+devices