My computer is all of sudden making a constant "fan" noise

For some reason my computer started today with a sound like a fan is constantly going.
Before this sound happened, my computer would not turn on. I proceeded to follow the steps (which I have to say is a royal pain in the butt to do) and yes, it finally turned on. But now I have this worry some noise as if it is over heating??
To further make matters even more confusing is now the battery indicator in the top right corner has an x in it and my battery charge indicator lights will not show up to tell me if my computer battery is fully charged AND my plug in cord's light does not turn on! The latter two problems just showed up AFTER my computer started up. The lights were before I had to turn the computer on the strange way. But now my computer is acting as though it doesn't recognize the battery! (It is the same battery!)

I checked into your link and followed the directions to a "T", but still no luck! My Macbook Pro is brand new, I just bought it last November. I do not believe my battery is no good since everything was working properly except the fact that it wouldn't turn on. I had a full charge on my battery and my plug in light WAS showing green. During the time when I was attempting to turn on my computer, I noticed the plug in indicator light had turned orange. Now I have no light on it at all. Also, I am still able to use my computer if it is unplugged.
My problems continue to be:
1) Sounds like my fan is continually on and will not turn off.
2) My battery charge lights do not turn on.
3) The battery indicator icon (top right corner) shows an "x" in the middle of it.
4) My plug-in indicator light will not light up.
If my problem truly is the battery, what are my options? I don't even know how to get to the battery!

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