[HP mt20 / 440 G4] No Display After BIOS Factory Reset (System Alive / Caps Lock Works)

[mhgrop]

Hi HP Community,

My HP mt20 (Celeron 3865U, shares the ProBook 440 G4 board) has a black screen after I selected "Apply Factory Reset" in the BIOS. The system is NOT dead; it passes POST but seems stuck at a hidden prompt.

Exact Symptoms:

• Screen is completely black (no backlight, no external HDMI signal).

• Exactly 4 seconds after power-on: it gives 1 single beep, and the HDD LED blinks rapidly.

• Caps Lock toggles normally, Fn shortcuts work, and moving the touchpad wakes the keyboard backlight.

Steps I’ve Tried:

• Hard CMOS reset (removed CMOS battery).

• Booting without the HDD.

• Blind BIOS recovery (Win + B) — ignores it, likely because the system boots past the recovery block.

• Blind keystrokes (Esc, F1, F2, F9, F10, Enter) after the beep, guessing it's waiting for a confirmation.

My Questions:

1. Does the 1 single beep indicate a hidden TPM physical presence or CMOS reset confirmation screen?

2. If yes, what is the exact blind keystroke combination to bypass or accept it without seeing the screen?

3. Did the factory reset cause an iGPU profile conflict (looking for a Core-i profile instead of Celeron), preventing display initialization?

Any advanced technical guidance would be highly appreciated. Thanks!

[Rita_R2]

Hi, @mhgrop, Welcome to the HP Support.

I will be more than happy to help you. while I am an HP employee, the views expressed here are my own and may not necessarily reflect the views of HP. By sharing relevant video links, I aim to provide clear, practical guidance in an easy-to-follow format. These tailored video resources are designed to address queries more effectively and enhance understanding. I hope you find them helpful as well.

Here are the links which will help to resolve the issue: 

HP Laptop Black Screen on Startup | Official HP Support Guide

Understanding HP Notebook PC Light and Beep Codes | HP Notebooks | HP | HP Support

Do keep me posted. 

  

Take care and have a good day. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping! 

RITA_R2

HP Support