My Dell laptop D620 was functioning properly until last week. Then there were some issues with the charger connecting properly to the back of the laptop. So I brought a brand new adaptor. Checked the battery and the lights (all of them) come up when simply pressed. However, the laptop is not charging up. I removed the battery and just tried powering up the computer without the adaptor connected. To no avail. I replaced the battery and the laptop will not power on. When I press the power button with the adaptor connected, all I see is an orange light come up in the middle of the LED display zone and blinks as long as the power button is pressed. Then it goes away. What to do? Any advise.