Hi all, I'm sorry for the late response.

I have tried to start instance in single user mode (the -m in configuration manager startup parameters)
But it still yields...

I'm not too sure if this is the right error log but this is from the summary.txt in C:\Program Files\Microsoft SQL Server\120\Setup Bootstrap\Log\

Overall summary:
Final result:      Failed: see...

thank you subramaniam
However, I could not perform DBCC CHECKDB. I cannot...