Alienware m14x Seven Beeps (With a twist)

I bought my m14x laptop in the summer of 2011. I've since been having problems with the seven beeps issue, which I know is most likely motherboard related, but my issues seem to be a bit different than most, so hopefully there's a different/cheaper solution (as a college student, I don't exactly have money back up for a $500 motherboard + installment). Here's a quick timeline of what's been happening:

1. In fall of 2012, my brother accidentally spilled liquid onto the keyboard of my laptop. Shortly after this (maybe a couple weeks) I first started experiencing the 7 beeps. Like others, my laptop wouldn't boot at first, but by shutting it down, and restarting, it would eventually boot.

2. The 7 beeps started again around Christmas 2012, but only lasted a day.

3.  Most recently, the beeps have been happening for the past 3 days. Every time the computer sleeps, it goes into 7 beeps mode. It could be entirely unrelated, but it seems to boot most regularly when I unplug and plug the power cable back in. 

I have noticed that every time the computer decides to boot, I hear a noise coming from inside the laptop somewhere below the directional keys. Hopefully all of this is info to maybe diagnose anything. Thanks!