Toshiba with black screen while pressing on b

Hello,

I have Toshiba Satellite laptop and it was working fine yesterday. I have plugged-in it with AC Adapter and the AC Adapter has the GREEN light. On front of the laptop, the power supply light (Blue LED) is blinking and the battery light is in RED. Nothing happens after pressing the Power button on the laptop. Thought of faulty AC Adapter and bought the new AC Adapter and the power supply light (Blue LED) is still blinking. How to fix this problem, PLEASE.

Thanks.