The keys Q, W, E, R, and U aren't working. I don't know why they refuse to work, and I've tried looking up what to do. I haven't tried to plug any external keyboard yet, since the keyboard itself works on and off. The Q, W, E, and R seem to work whenever I click the U key, like it was somehow connected to it. I don't know what to do, and it's becoming a pain to bare. Can you help? It's a Inspiron 15 Dell laptop, the touchscreen 2014 model.