Bios/ system not working

[Zoe71]

Hi all need some help out sons computer is not working it comes up with a F20 code and basically now can't do anything with it we have tried all the trouble shooting with no luck any ideas of next steps.

Thanks 

He has the desktop all in one 

[Zoe71]

 

[TheOldMan]

That error typically means the hard disk is failing, but it can also be caused by something interfering with the boot process.

To verify the situation, run the Diagnostics routine. This will tell if the drive has failed or not.

To run the Diagnostics routine, Start tapping the Esc key BEFORE starting the PC and then press the start button.
Keep tapping the Esc key until a popup menu shows. Then pick Diagnostics from that popup menu, F2.
Report back with the results. Also need the complete PC model number.

[Zoe71]

Thank you says passed 

Pc model number is 

Hp all in one desktop 24-cb1xxx

[Zoe71]

Thank you says passed 

Pc model number is 

Hp all in one desktop 24-cb1xxx

[TheOldMan]

Since the Diagnostics found the drive and indicates it passed, then the bootloader must be corrupt.  

Check this : https://support.hp.com/au-en/document/ish_3053911-2842957-16

You can go to step 4

Reinstall Windows on the hard drive

Reinstall Windows through the Windows Recovery Environment (f11) or using the HP Cloud Recovery Tool.

• Use the steps from HP PCs - Reset the computer to perform a system reset through Windows Recovery Environment (f11) when Windows does not start.

• Or, to use HP Cloud Recovery Tool, see the document for your computer:

  • HP Consumer PCs - Using the HP Cloud Recovery Tool in Windows 11 and 10

  • HP Business PCs - Using the HP Cloud Recovery Client in Windows 11 and Windows 10

• If no drives can be found when reinstalling Windows, see HP PCs - No drives can be found during Windows 11 or Windows 10 installation (Intel 11th Generation ....