Toshiba Satellite L305D Laptop Fails to start up

Hi,
I have a Toshiba Satellite L305D laptop. When I put my laptop on, it does not go on.
When i press on the power button, the battery light on my laptop blinks 6 times and thereafter nothing happens. The laptop does not go on.
The color of the battery light is orange. I know for a fact that my laptop battery is not good anymore. I have not been using my laptop without it being plugged into power.
Yesterday, I plugged it in but it just did not want to start up. If the battery is no longer good the laptop should at least still work when plugging into a power outlet.
Is the power adapter maybe defect?
Please advice.
