Hi, and thank you for asking your question.
First off, while at the screen where it's hung up, please press and HOLD down the Power button for atleast 30 seconds (even after the screen has turned off), and then release the button.
Next, press the Power button one more time to turn the laptop back on - does it boot up all right this time?
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Hmm, I see. Now, please restart the laptop one more time, and then tap the F11 key repeatedly right after it boots up, at the HP logo. Does this bring up a recovery screen/window, by any chance?
Keep me posted.
Okay. Now, please remove the battery from the back of the laptop, and disconnect the power adapter as well.
Done that, HOLD down the Power button for atleast 30 seconds, and release the button.
Connect just the power adapter after that, and press the Power button - what shows up this time?
Did you connect back the power adapter this time, before pressing the Power button?
OK; connect the battery as well now, and then press the Power button one more time.
Please go ahead and connect the battery now, and then press the Power button - what shows up now?
That's odd; this indicates a hardware issue with the laptop (which might have been contributing to the stuck screen earlier as well.)
Please go ahead and carry out the same steps one more time; disconnect battery and charger, and hold down the Power button for atleast 60 seconds this time, and then plug in the charger and press the Power button one more time. Does this make any difference to the issue?
OK; this most definitely indicates a motherboard issue here - the screen was stuck earlier because the motherboard failed while resetting the laptop, and after doing a hard reboot as we just did, it simply failed to boot back up because it was unable to read from the motherboard.
I'm not sure if this issue can be fixable here - would you like me to open up the question to our other experts who might be able to assist further?
Okay, no problem; I'll close out this question for you now - if you could kindly take a moment to click on a star at the top of this page to rate my service, that would be much appreciated. Thanks again.