Again I adjusted the only audio setting in the bios to enable HD audio. I emailed gigabyte tech support. I enabled the HDMI output(tv) device. I had audio but unfortunately had the incessant beeping back again. At this point I updated the intel graphics driver. No improvement. I reinstalled the latest realtek hd audio driver. No improvement. I even reinstalled the realtek lan driver as I read about a similar issue regarding that software. No improvement. Next I started removing unnecessary software one by one. I exited and uninstalled Gigabyte's Easytune software, which I really don't like anyways. The problem went away. Normal sound output over HDMI. I searched and haven't seen this problem described before. It ended up being an easy fix though.