One thing I've noticed with my AB9 Pro is if put the PC in Standby rather than Shutdown it turns itself off and if I press the Power button it turns back but the audio is screwed up. First thing I see is the Realtek HD audio tray icon in the system tray reports that "A jack has been unplugged". I only am using 2 channel audio and so there is just the one audio cable plugged in. But of course it is still plugged in even though the software thinks not.
Although in Control Panel it still shows the Realtek HD Audio as the driver, if I try to play any sound then I get errors (Divx comes up with Audio Tag 85 codec errors for MP3), playing system sounds says it can't playback the file or the file is corrupt etc. I've seen these before if you try to play audio with no sound card in the system.
Shutting the system down conventionally and rebooting brings everything back to normal.
Anyone seen this type of behaviour?