Dell1525-won't charge anymore, and I'm not sure what to do?

Last night I was doing homework, and went to get up, and my foot kind of slipped up on the power cord but nothing out of the ordinary, everything stayed in place. Well I came back to my computer, and it had stopped charging, so I thought it must have unplugged somewhere, so I tried plugging it back in and it wouldn't charge. I then tried a couple other outlets and it still wouldn't charge. I'm concerned because I bought this computer at a rent to own place, so I'm hoping they will send it in for repair, but I still would maybe like answers as to why this happened? Anyone have any ideas?