I have a Dell Inspiron 9100. I have checked the adapter/charger and it is putting out he correct 19V. However, the LED lights on the battery do not indicate anything. After charging for 10 hours, I push the power button and nothing happens....no screen activity, whirling, noise, etc. I have tried starting with adapter connected and not connnected. Could a battery be so dead that the computer will not turn on? Or is it the MB or bios? Thanks.