Hp pavilion m6 Caps lock blinking once after 3 secs no boot

Hi

2 days ago My hp pavilion m6 turned off suddenly for 2 3 times without warning. But it was able to turn on.

But today after a sudden turn off it is not turning on. Just gives a black screen, no fan etc. And Capslock keep on blinking once after 2 3 secs. And sometime it turns off after only one caps lock blink.

After sudden key combinations like pressing all arrows keys or alt+del+ctrl and power on. I am able to make caplock blink but on ac adapter capslock blink only once and laptop turns off. On ac adapter, there is no continuous capslock blinking just one caps lock blink and it turns off.

please help me.

Please help me here.