I have a Dell Latitude D610 laptop and the charger that i use doesnt work. It worked about a week ago, but now everytime I plug it in, it doesnt charge, the green light that is on the power unit doesnt light up, and it makes this tiny beeping noise. Anyone know why its not working and how to get it to work?

Best thing to do is buy new one from Dell themselves.
It could be the charger or a terrible power jack on the motherboard. I would check e bay for a used one first. Also see if it Works if you wiggle the connection into the computer
Buy another one, or maybe u might have overcharged the laptop and it doesnt need 2 I suggest u buy another and if it doesnt work go to any local tech pro