HP PRO 3520 All in One Business PC - POST BOOT PROBLEM

[Kazmitch]

Hi, I have a problem with the All in One PRO 3520.
After the start it stands on the HP logo.
Disconnecting the HDD did not help.
Bios recovery does not work (win + b).
RAM test also nothing.
Resetting C-MOS or ROM recovery does not help.
Test the motherboard itself with only the basic components to make it work - no result.
CPU i3-3240
Without dedicated VGA.

Anyone think about it?
Thank you for the ideas 🙂

[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

NOW begin checking/testing/proving the Hardware is fit for purpose.
Power on your PC, press ESC (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).