Note board web part is available in SharePoint 2010 Standard(and higher) edition. It can be used by users to post comments, ask questions or discuss on different topics. Sometimes it can happen that when You add a SharePoint’s note board web part to a page, it will display only the web part’s header. This problem is strictly connected to User Profiles Service.Note board with this problem is going to look more or less like on the below screenshot:

To fix this You have to start the user profile service on Your SharePoint server and connect it to the web application where You added the web part. You can do this by going to Central administration -> Manage web applications -> select the proper web application -> click Service connections in the Ribbon -> Tick the checkbox next to the User Profile Application -> click OK.

If everything went good, You should now see a comment box below the Note Board header: