my asus vs247 monitor does not have sound

I am using an AMD HD5870 video card and tried reinstalling drivers with no luck. Before it shuts off, it will start to flicker. It will come on but shuts off after about 15 seconds or so and the power light stays blue, doesn't turn yellow like it's going into sleep mode. I use this as a secondary monitor on a desktop and it will not stay on. VGA is analog.I have an Asus 19' VW193 monitor and having issues with it. HDMI is great for sending Video+Audio in the same cable but it's no different to DVI which is digital and pin compatible with it. Troubleshooting so far: I asked on the Gigabyte online tech support and the only suggestion they had is that for appropriate HDMI 'handshaking', the cables should be fully connected before the screen and computer are switched on (this practice however has not removed the symptom in my system). It does not happen in Linux which indicates its root cause lies in the Windows Nvidia Graphics Driver for the card. The same problem is duplicated in a different system with the same hardware and it still exists after my graphics card was replaced under warranty. Symptom: In Windows 7 with HDMi my screen regularly goes blank for about 5 seconds once every 5 minutes. It has to be a driver issue because this is what I've found out while troubleshooting. I have similar problems while connecting the AOC external LCD with the dedicated Gigabyte Graphics card via HDMI. As of now the newest driver from Intel (ver 15.26.) does not fix this. After uninstalling Intel HD Graphics 4000 driver, HDMI would work. But after I restart, everything goes back to normal. So VGA and HDMI are selectable as different monitors in the relevant dropdowns. Strangely the HDMI cable starts working every time I re-install Intel VGA driver (the 'ding-dong' sound), and is recognized in the device manager and display settings. I tried unplugging/replugging cables, reinstalling drivers (Intel Graphics HD 4000), but to no avail. After the 'Starting Windows' screen the monitor complains 'HDMI no signal'. The monitor displays HDMI picture fine from boot-up (BIOS messages/settings) up until Windows 7 loads. Soon after I got my hands on an HDMI cable, I tried to replace the VGA one with it. I have an Asus 247H monitor which I hooked up to a Gigabyte motherboard's (GA-Z77-D3H) on-board VGA port at first.

My asus vs247 monitor does not have sound