Black screen on start up

[GentPC]

I’m having issues with my HP pavilion 27 all-in-one pc

it will not boot up on start up

done hardware reboot procedure and still nothing

need help?

[Max3Aj · Accepted solution]

@GentPC, Welcome to the HP Support Community – it’s great to have you here!

I appreciate you taking the time to share your question. I'm more than happy to assist with this and provide a solution that works for you.

I understand your HP Pavilion 27 All-in-One PC is showing a black screen and not booting up, even after attempting a hardware reboot. Let’s walk through a few steps to help resolve this issue.

Perform a Power Reset

This helps clear residual power and can fix startup issues.

• Turn off the PC and unplug the power cord.
• Press and hold the power button for 15 seconds.
• Reconnect the power cord and try turning it on again.

Check the Display

Ensure the issue isn’t with the display itself.

• Shine a flashlight at an angle on the screen. If you see a faint image, the backlight may be faulty.
• Try connecting an external monitor via HDMI (if available) to check if the system is booting but the display is not working.

Listen for Beeps or Fan Noise

• Do you hear any beep codes, fan spinning, or hard drive activity?
• If yes, note the pattern of beeps, they can indicate specific hardware issues.

Try BIOS Recovery

HP systems often support BIOS recovery from a black screen.

• Turn off the PC.
• Press and hold Windows key + B, then press and hold the power button for 2–3 seconds.
• Release the power button but continue holding Windows + B for another 10 seconds.
• If successful, the BIOS recovery screen should appear.

Disconnect Peripherals

• Unplug all USB devices, SD cards, and external drives.
• Try booting with only the power cable and keyboard/mouse connected.

Reseat RAM (if accessible)

If you're comfortable opening the back panel:

• Power off and unplug the PC.
• Remove and reinsert the RAM modules.
• This can resolve issues caused by poor contact.

If none of the above steps work, the issue may be hardware-related, in that case, please visit the nearest HP authorized service center, the service team will check and assist you. 
Kindly follow this link to locate the nearest HP service center: HP® Service Center Locator - United Kingdom | HP® Support
(Select the country from the dropdown menu and enter the city name or pincode)

I hope your issue is now resolved. If not, feel free to reply and we’ll continue helping until everything’s sorted!

If the post helped, please click “Accepted Solution” to help other users easily find it. And if you’d like to say thanks, just tap the “Yes” button!

Cheers,

Max3Aj

HP Support