Error number 2003 Can ' t connect to MySQL server ' localhost ' (0)

1. Error description
   

2. Cause of error
   Recently, I have been able to use SQLyog to connect to the local database, but in recent days but unable to connect, and always reported the above errors, I looked at a lot of information, found that there are many of the said
   Summarize
   First, the My.ini error in MySQL;
   second, insufficient authority;
   Thirdly, it is possible to modify the user table that comes with MySQL;
   Four, the MySQL service stopped.

3. Solutions
   For the above reasons, I have also tried to find or report this error;
   Later, I re-installed MySQL, again using SQLyog to connect to the local database, the result is successfully connected.

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Error number 2003 Can ' t connect to MySQL server ' localhost ' (0)