Error while moving model database

I have moved the model database by using following method

1. For each file to be moved, run the following statement.

ALTER DATABASE model
 MODIFY FILE ( NAME = modeldev , FILENAME = 'G:\model\model.mdf' )
ALTER DATABASE model
 MODIFY FILE ( NAME = modellog , FILENAME = 'G:\model\modellog.ldf' )

2. Stop the instance of SQL Server to perform maintenance.
3. Move the file or files to the new location.
4. Restart the instance of SQL Server or the server.

While restarting instance of server i am getting following error.

The request failed or the service did not respond in a timely fashion. Consult the event log or other applicable error logs for details.

How to solve this error?