Problem in starting power laptop

I have the laptop when i plug in the power adaptor without push the power button its make the power led blink continously with average 1.5 sec on and less 0.5 sec off and this can be continous for long time and when i push the power button no thing is happen (i think this cases is the laptop restating every 1.5 sec continously)

When i work with battery almost same case happend but when i push the button for one times blink only