To start Mysql Manually from the command line follow the steps and command stated below:
Open window console-> executes the following command:
shell> "C:\path\MySQL\MySQL Server 5.0\bin\mysqld"
The path can be according to your system.
Have Mysql server right there, If you still find an error to start kindly check the error log to look up the files .err extension find the reason, and troubleshoot it.
And if you want to stop the Mysql kindly execute the below command:
shell> "C:\Path\MySQL\MySQL Server 5.0\bin\mysqladmin" -u root shutdown.