The System Check tests your server and your Jamroom setup, and says what needs attention. Run it after installing, after moving your site to another server, and whenever something isn't working.
Open it at ACP > Modules > Core > System Core > Tools > System Check.
Each line has a Value, a colored Result and a Note:
The checks come in groups:
ffmpeg, convert, sox, ...) are present and work.Create the Admin Account explains the lines a new site usually shows. If a note doesn't tell you enough, ask in the Support Forum and include a screenshot of the line.