Starting screen problems

[JohCR]

After starting up my All in One screen, becomes black, good, black and good . after four times my screen is ok/

[VikramTheGreat]

Hi @JohCR,

Welcome to the HP Support Community.
 

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

I understand your HP Pavilion All-in-One 27-d0010nd screen goes black repeatedly during startup and then works normally after several flashes. Let’s try a few steps to help stabilize the display.
 

1. Disconnect external devices 

• Remove all USB devices, printers, external drives, etc. 
• Restart the All-in-One and check if the behavior changes
   

2. Perform a hard reset 

• Turn the PC off 
• Disconnect the power cable 
• Press and hold the Power button for 15 seconds 
• Reconnect the power and turn it back on
   

3. Update Windows and graphics, drivers 

• Go to: 
  • Settings → Windows Update 
• Install all pending updates 
• Also, update the display/graphics driver from HP Support Assistant or Device Manager
   

4. Run HP Hardware Diagnostics

• Turn the PC on and tap Esc repeatedly 
• Press F2 for Diagnostics 
• Run: 
  • Display test 
  • System tests
     

5. Perform a BIOS restore/recovery
Please follow these steps carefully: 

• Turn the computer OFF 
• Press and hold Windows + B 
• While holding the keys, press and hold the Power button for 2–3 seconds 
• Release the Power button, but continue holding Windows + B for about 5–10 seconds 
• The BIOS recovery screen may appear, or you may hear beeps 
• Follow the on-screen instructions if prompted
   

6. Check startup apps 

• Press Ctrl + Shift + Esc 
• Open the Startup tab 
• Disable unnecessary startup applications temporarily and restart

I hope this helps.

Take care and have an amazing day!