HP 24 All in One 24-cb1224 - Black Screen

[George1234w]

Hi - My MIL sent a damaged PC my way.  It appears to be an HP all in one 24 24-cb1224.  When I plug the PC in, the light around the power barrel connector lights up, when I hit the power button, a light comes on near the button.  The screen is completely black, no flashing, no bios, nothing.  I thought the display might be bad so I hooked up an external monitor without any luck. 

I also tried to reset it by holding the power button for 20 seconds after I unplugged everything and the same behavior re

[Irwin6]

Hi @George1234w,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to assist you.

I understand you're experiencing an issue with your All in one PC that boots to a black screen.

I apologize for any inconvenience this may have caused, I'm here to help you today.

Please follow the steps below to perform an extensive system test to confirm if the hardware is working fine.

1) Shut down the computer.

2) Turn the computer back on again and repeatedly tap on the ESC until a Startup menu appears.  

3) Press F2 once.  

4) Go to the system test > extensive test

If the hardware is working fine. click on this link to perform a recovery on your PC.  (Take a backup of the data before performing a recovery)

Please mark this post as “Accepted Solution” if the issue is resolved and if you feel this reply was helpful click “Yes”.

I hope this helps.

Take care and have a great day ahead!

 Irwin6

HP Support

[George1234w]

Hi, thank you for the reply. 

I tried the steps you indicated and was not able to get to a startup screen.  No video of any kind is coming up on the screen with and without an external monitor attached.

What else can I try?

[George1234w]

I opened it up and replaced the CMOS batter to see if that did anything.  The power button lights up a steady white (which it did before) and I don't get any flicker or video at all.

[George1234w]

I have done the following troubleshooting.

1. Tested power with multimeter - its working

2. Changed RAM to a different slot

3. Unplugged everything (SSD etc...) to see if I could get anything to happen

ANything else?

[Irwin6]

Hi @George1234w,

I am sorry to hear that the above steps did not help much but i do appreciate your efforts in performing the troubleshooting steps.

As you have exhausted all the possible troubleshooting steps to fix it. We appreciate your understanding and patience.

I've sent you a private message with the instructions to get in touch with the HP phone support to assist you further. In order to access your private messages, Click the Private message icon on the upper right corner of your HP Community profile Next to your profile Name, you should see a little blue envelope, please click on it or simply click on this link

Take care and have a great day ahead!

Irwin6

HP Support

[George1234w]

How can I look up exactly what motherboard I need to replace it?