I just got a new Dell Inspiron 1545, and upon startup for the first time, the click sound for navigation start is not working...at least on a regulas basis. Once in a great while it will work. I know where to change the sound and disable it, and that does work, but the factory sound of "navigation start" doesn't. Even if you select the sound and click play to test it, it doesn't work. If you go to the file location and right click play, it sometimes plays in Media Player. I've even done a pc restore and the same thing. I've contacted Dell and they are sending me a new hard drive. Is that the problem or the sound card or something else. I just want my new computer to work like it should.