The white led is turned on but the computer does not respond!

I have o Toshiba Satellite C850-16w. I turned on my laptop, i finished my work and then i shut it down.
After a while, i remembered sth and i decided to turn it on again. I saw the white led blinking and i plugged it in and then tried to open it. The white led does not blinking anymore (it is on) but the computer does not turn on.

What should i do?