We have a Windows 2008 Hyper-V cluster VM failed every night in the past week. And it gives me the error: ‘VM-01’ Microsoft Emulated IDE Controller (Instance ID {83F84444B-8DCA-4152-9EDA-2CA8B33034B8}): Failed to Power on with Error ‘A device attached to the system is not functioning.’ (0x8007001F). (Virtual machine ID 1241E22E-E750-44C7-91F7-7588C8FBB9AE)
After a quick search, I found this is actually a Windows bug that is triggered by the third party backup software. The solution is to hack the registry key:
1) Visit the following registry key: “HKLM\SYSTEM\CurrentControlSet\Services\FsDepends”
2) Under the “FsDepends” key, change REG_DWORD value “Start” from “3” to “0”
3) Restart the server
Reference
http://support.microsoft.com/kb/2013544
http://msdn.microsoft.com/en-us/library/windows/desktop/dd323654%28v=vs.85%29.aspx
Jackie Chen's IT Workshop 
Helped me Greatly thank you
If that is not working for you, disable the anti-virus on the owner server. That worked for me!
The same issue may be caused by different reasons. It has a big possiblity that the AV can lead to similar problem. But disabling the Anti-Virus is risky, I would recommend you to use the exclusion list.
Thank you Thank you Thank you!!