This laptop had a non-responsive keyboard. I plugged in a USB keyboard, and that worked. However, whenever I get to a spot where I can enter text (search box or URL line in a browser, anywhere), a never-ending string of zeroes starts up. As the keyboard wasn't working, I thought perhaps it needed to be replaced to fix the problem. No dice...new keyboard didn't change a thing. I even booted up the computer with Sysrescue CD and once I got to a spot to type something here come the zeroes.