After a power outage - yes another one! - a VM would not start - checked the boot and the VM had an ISO in the DVD image that was no longer in place. Removed ISO from DVD boot-up and all was well..
Log Name: Microsoft-Windows-Hyper-V-Worker-Admin
Source: Microsoft-Windows-Hyper-V-Worker
Date: 28/11/2017 22:00:05
Event ID: 12030
Task Category: None
Level: Error
Keywords:
User: NT VIRTUAL MACHINE\
Computer: compuername.domain.suffix
Description:
'AWCNSAN' failed to start. (Virtual machine ID )
Event Xml:
12030
0
2
0
0
0x8000000000000000
948
Microsoft-Windows-Hyper-V-Worker-Admin
IPVM0.domain.suffix
AWCNSAN
106925A8-DA68-4D41-8293-0014FE5A27AD