Error shows unsupported adapter and does not start

[Pradyumn1]

Model number 24-b015a

3 Beep sound occurs and does not boot 

Screen shows 'unsupported adapter ' and shuts off after 1 seconds 

[Lil_Boy_Blue]

Hi
First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

AND/OR - Power on your PC, press Esc (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).
AND/OR
HOW DO I USE DIAGNOSTICS?

HP PC Hardware Diagnostics Windows is a Windows-based utility that allows you to run diagnostic tests to determine if the computer hardware is functioning properly. The tool runs within the Windows operating system in order to diagnose hardware failures. HP PC Hardware Diagnostics Windows comes pre-installed on new HP computers, but if not on yours, download here:- http://ftp.hp.com/pub/softpaq/sp93001-93500/sp93457.exe

https://support.hp.com/us-en/document/bph07107

3	MEMORY READ OR WRITE FAILURE

1 long beep followed by 2 or 3 short beeps

UNABLE TO INITIALIZE VIDEO (TO DISPLAY THE POST CODE)