Thanks for the information Consisnice.
Would you please try our latest Graphics driver version 3621? Please let me know your findings. https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&ProdId=3720&DwnldID=23884&ProductFamily=Graphics&ProductLine=Desktop+graphics+drivers&ProductProduct=4th+Generation+Intel%C2%AE+Core%E2%84%A2+Processors+with+Intel%C2%AE+HD+Graphics+4600&lang=eng
In addition to that, could you test your system using another HDMI cable? We recommend using an HDMI 1.4a cable, since this is the only one that support audio and video.