Check the first hardware as like power socket, power supply, and battery working properly. Then check your power code is working fine. In that case, the power-on button of your laptop blinks repeatedly. At such a time, your computer remains on the level for only 2-3 seconds. Then slowly your computer shuts down for a short time for hp laptop won t turn on problems.In such a situation, it is most likely that your power cord has been damaged. You can also change the Power card of your laptop and resolve these issues, please.