I bought an external hard drive yesterday. I was playing Portal (which I had saved on it) and I accidentally pulled on the cord and the hard drive fell about 2 and a half feet. The outside casing came off, but I was able to get it back on. Now when I try to plug it back in, my laptop isn't even noticing it's there. There seems to be no internal damage. Is there something I can look up? Should I take it back to Staples? Any help is appreciated. Thank you very much.