The HP Pavilion 24-b All-in-One PC is a popular choice for home offices and entertainment setups, thanks to its sleek 23.8-inch display and space-saving design. However, one of the most frustrating issues users encounter is a sudden black screen—the machine powers on, fans spin, yet the display remains completely dark. If you're facing this problem, don't panic. This guide walks you through a systematic troubleshooting process, from simple fixes to hardware-level solutions.

Step 1: Rule Out Power & Connection Issues

Before diving into complex diagnostics, start with the basics:

• Check the power cable and adapter.Ensure the AC adapter is firmly plugged into both the wall outlet and the rear of the PC. Try a different outlet to eliminate a faulty socket.

• Perform a hard reset.Unplug the power cord, press and hold the power button for 15–20 seconds to drain residual charge, then reconnect and power on.

• Disconnect all peripherals.Unplug USB devices, external monitors, and SD cards. A faulty peripheral can sometimes halt the POST (Power-On Self-Test) process.

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Step 2: Listen and Observe

When you press the power button, pay close attention:

• Do you hear the fan spinning or the hard drive/SSD initializing?

• Are there any beep codes or blinking LED indicators?

If the system produces sound but the screen stays black, the issue likely lies with the display panel or its connection. If there is absolutely no sign of life, the problem may be with the motherboard or power supply unit.

Step 3: Test with an External Monitor

Connect an external monitor or TV via the HDMI-out port on the back of the Pavilion 24-b. If the external display shows the desktop normally, the GPU and motherboard are functioning correctly, and the fault is isolated to the built-in screen assembly—either the LCD panel itself, the backlight inverter, or the internal LVDS/eDP cable.

Step 4: Inspect the Internal Display Connection

If you're comfortable opening the rear panel (note: this may void your warranty if still active):

1. Power off and unplug the PC.

2. Remove the rear cover screws and carefully detach the panel.

3. Locate the display cable connecting the motherboard to the LCD module. Reseat the connector firmly.

4. Check for any visible damage, pinched wires, or corrosion.

A loose or damaged cable is one of the most common causes of a black screen on AIO PCs.

Step 5: Address Screen Hardware Failure

If reseating the cable doesn't resolve the issue, the LCD panel or backlight may have failed. Common symptoms include:

• A faint image visible under a flashlight (backlight failure)

• Visible cracks or discoloration on the panel (physical damage)

• The screen flickering before going completely dark

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If the screen is cracked or the backlight has failed, you can replace it with an originalLM238WF1-SLE1 LCD Module.This 23.8-inch IPS panel is the exact OEM specification used in the HP Pavilion 24-b series, ensuring full compatibility in resolution (1920×1080), connector type, and mounting dimensions. Swapping in a matching-grade panel restores your AIO to factory display quality without the cost of an entirely new computer.

Note: When replacing the LCD module, handle the panel edges with care, avoid pressing on the polarizer film, and ensure the eDP ribbon cable is seated at a 90° angle before locking the connector.

Step 6: Update or Roll Back Graphics Drivers

In rare cases, a corrupted GPU driver can cause a black screen at boot. If you can access Safe Mode (press F8 repeatedly during startup or interrupt the boot three times to trigger Windows Recovery):

• Navigate toDevice Manager → Display Adapters.

• Right-click the Intel/AMD/NVIDIA GPU and selectUninstall Device.

• Reboot and let Windows reinstall the driver automatically.

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Step 7: BIOS Reset

A corrupted BIOS setting can also prevent display output:

• With the PC powered off, locate the CMOS battery on the motherboard.

• Remove it for 5 minutes, then reinsert and power on.

• Alternatively, enter BIOS (F10 key at startup) and selectLoad Default Settings.

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When to Seek Professional Help

If none of the above steps restore your display, the issue may involve the motherboard's GPU solder joints, a failing power rail, or firmware corruption that requires specialized reprogramming tools. At that point, contacting an HP-authorized service center or a qualified repair technician is advisable.

Final Thoughts

A black screen on the HP Pavilion 24-b doesn't necessarily mean the end of your PC. In the majority of cases, the fix ranges from a simple cable reseat to a straightforward LCD panel replacement. By following the steps above in order, you can pinpoint the cause quickly and get your all-in-one back up and running—often without an expensive service call.