My HP Z240 running Windows 11 suddenly stopped booting. The only message displayed is "Kernel Security Check Failure." The system has 24 GB of RAM and a 2 TB drive. What troubleshooting steps can I try to get Windows to start without risking my data?
1 Answer
Power the computer off, then repeatedly press the BIOS setup key as soon as you turn it on. Check whether Secure Boot is enabled and try temporarily disabling it, then save the settings and test Windows. If it boots, back up your important files immediately. If changing Secure Boot does not help, the boot files or Secure Boot keys may need to be repaired or re-enrolled through the firmware or Windows recovery tools.
I tried disabling Secure Boot, but it still will not boot.