To get to the HD you have to remove the front bezel. There are two plastic tabs that have to be pressed/pulled , can't remember which at the bottom of the computer. Turn it over and you will see what I mean. With the tabs operated, pull the bezel out at the bottom, the top is hooked in with tabs. There will be quite a bit of resistance from the bezel when you remove it, be careful not to damage the plastics. The HD will be visible to you with the bezel removed.
If it ain't broken, don't fix it!