Ask HP Pavilion All-in-One - 24-r015z 3 Long 4 Short beeps

[Static Troll]

Hello all,
Have a issue with a HP Pavilion All-in-One - 24-r015z giving 3 short 4 long beeps, I have tested with another charger as it looks like the original was not used as well as tested with a different flash for the bios as well but I still get nothing on the screen and the system beeping. Any other suggestions would be greatly appreciated.

 

[ThienBui]

The beeps and leds are very helpful, you need to try the bios first, then the hardware

 

[Static Troll]

Found the issues, tested with my dc power supply and set it manually to the exact same v/a as an official adapter but it ended up beeping still. Used official adapter and it worked no problem and booted up, switched back to my dc power supply and same thing happened.