Hi
Welcome to the HP Support Community.
To better assist you - May I have the exact model name of the product? Refer to this document for steps to find the product details. Do not share any of your personal information such as serial, phone number, email ID, etc.
While you respond to that, try these steps -
Step 1 Hard Reset -
1) Shutdown the computer.
2) Unplug all the Adapter and peripherals connected.
3) Press and hold down the power button for 15 to 20 seconds.
4) Plug-in the Adapter.
5) Try to turn on the computer.
Step 2 BIOS Restore -
1) Shutdown the computer.
2) Hold down the Windows and B button together while the computer is still turned off.
3) Turn on the computer and continue to hold the Windows and B button until a BIOS Recovery screen appears.
4) Follow on-screen instructions and click on OK
If the issue still persists, try these steps - HP PCs - Computer Does Not Start
Hope this helps! Keep me posted.
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Have a great day!