I purchased my Alienware about a year and a half ago and for a week or so I've been having serious problems with the charger. when it's plugged in it won't work, the blue light on it doesn't turn on and it ofcourse does not charge my laptop. It has to be in a very specific position so it works, and if it moves the slightest it will stop working again. Any tips on how to fix it? Thanks!

Edit: I just noticed a buzzing noise when it starts/stops working