I only have a DSi XL (All the other ones have either been sold or given away) and it doesn't make a sound on the first hinge, which is a hinge that allows for comfortable viewing on a table (like on the commercials.)
The second hinge, which is the hinge that the DSi normally is played on, makes a snap, but it sounds normal.
The second hinge, which is the hinge that the DSi normally is played on, makes a snap, but it sounds normal.