Please remove pid file manually, then start mysqld. If you turned power off it is expected mysqld had no time to remove pid file.
These files are usually under the mysql data directory.
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It runs all of your website's databases, WHM/Cpanel control panel databases etc. There could be many reasons behind the failure of the service.
If you are getting this error when you try to start mysql server, mysql is having a problem with one of the variables that you have in its configuration file
Manager of pid-file quit without updating file First verify that this is true. If you do not know where is, you can do “locate my.cnf”.