The service mysql56 failed the most recent status change request with the message
The service mysql56 was not found in the Windows services if problem persists please restart mysql notifier

解决办法，点击mysql图标，选择Actions下的Manage Monitored Items，如下图所示：

然后将Services中的内容，和Instances中的内容全部删除，之后再Services页面，点击Add Windows Service，Filter中写入mysql，然后在下方选择MySQL57，点击OK即可。然后点击mysql图标，start即可。