I'm using a Presario V3015NR and this afternoon when I started it up, the laptop just does not register it. Its one with a switch, and the light shows that is off no matter what position I put it in. I reinstalled the drivers to no success either. I'm not sure it even shows up in the device manager unless it is a "Base System Device". It was working solidly for a month though. It tried updating the bios but again, nothing. Any ideas?