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I see from the post that you are having loud popping noise after the notebook shuts down. I'll try my best to help you with this.
This popping sound could be from the speakers or from some component on the board reaching a limit and causing the system to go down.
Let's try these steps:
Perform a hard reset
Try to update the Bios and sound card drivers, using this link.
If the issue persists, then the popping sound is a component on the board reaching a limit and causing the system to go down. This problem will require a repair. Here is the link so you can contact the correct department at HP Support.
Link to contact HP: Click here
I hope this helps. Let me know if you need any further assistance.
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Regards,