This sounds like a driver incompatibility. I have dealt with similar issues before. What BIOS version are you running?
Many of the old BIOS versions on new boards do not fully support new GPUs. If you have the most recent BIOS version, start by completely uninstalling the GPU driver and sound driver. Then download the most recent driver for the GPU from AMD and go to the motherboard website and download the most recent sound driver. http://www.asrock.com/mb/Intel/H87M%20Pro4/?cat=Download&os=BIOShere
are the BIOS downloads.