Is my Nikon d3100 broken?

Ok, I have NEVER dropped my camera, which I bought about three months ago, but I think it's broken?! The camera does not sound right when I take a picture, and parts of the picture taken and saved flash black and white! Like, the brightest part of the shot will flash black and white. What's wrong with it! D:

Added (1). Hondo, I did read the instructions. I'm just worried because it does not sound right when it takes a picture.

Added (2). Alright, I fixed the blinking light, it was the exposure like you guys said. Thank you! However, I'm still having a problem with the sound. When I click on the shutter-release button, it sounds really weird. It's hard to explain. It's as if it clicks normally, then lags? It only makes one sound as opposed to the normal shooting sound. And it lags? I'm sorry I can't explain the sound right. :/ I'm really worried though.

The black and white means it's overexposed. Use the down arrow on the keypad to disable that. The weird sound is another matter. Take a pic or two on auto outdoors in an evenly lit situation and post here.

That is the overexposure indicator. If you had bothered to read the instructions that came with your camera, you would know this.

No problem. Nikon DSLR's have several display modes. If you press the control 4-way pad on the back left or right, you switch displays. One of them displays the highlighted exposures, others give more color information, and one is the version you're used to. Just press the 4-way pad til it's back to what you want.

Don't feel bad, we've all accidently pressed and changed the display before. No big deal.

Settings are all you need to fix. As long as you can take pictures I think you are good to go.