dreamerz :
yeah those are supposed to be there. Try using an air duster and see if anything blows out. use something small an plastic to see if it'll go in all the way or something blocking it. Do this while the pc is off.
So I stuck a small plastic paper pin in and it made it all the way but it took a little force. I observed that when I try to plug in my headphones those 2 metal parts sticking out are in the way.
But it makes me feel like it's meant to be that way because the microphone plugin has the exact same problem as the headphone one.
I kinda feel those metal half circles are the problem because they are the only reason my headphones can't plug in all the way, but that is a complete guess as I'm kinda a noob at computer stuff.
Also, why dont my usb 3.0 ports work? the 2.0 all work and I've looked through the whole bios and it says usb 3.0 is enabled. I have the asus p8b75-V Mobo if that helps.