Deployed soldier with Alienware m14x r2 issues.

Over the past two weeks, my Alienware laptop has decided to make my life interesting. The first issue was my external hard drive randomly stopped being picked up by the USB port. So, I did a restore point, it fixed the issue but after I did this, my computer would make 7 loud beeps on start up. Second issue, random programs such as Firefox download helper, stopped working. Third issue, (kind of my own fault) I spilled milk on the arrow keys but everything worked fine until the next day. First my keys were freaking out and binding. Then the right arrow key completely stopped working. Now it works again but when I use it, it will go nuts as if I am holding it down. What is going on? and how in the hell do I fix this. The laptop is only 7 months old and I've experienced so many issues with it in such a short time. Please help