I have HP pavilion 13-u100 x360 from more than one year now. I connected HDMI to screen for while after that I turn it to sleep mode. When I tried to reopen it nothing happens except the power signal was on and access to hard signal as well then it's coming off again. I noticed the two signals on & off with continuous cycle. I connected the charger and tried again but the result was the same situation. I tried to disconnect it and press the start button for 20 sec to get started nothing happens. What can I do next?