The computer shows that an invalid signature has been detected. Check the security boot policy in the settings: This means that the computer shows that an invalid signature has been detected. Check the security boot policy in the installer.

1. There may be something wrong with the computer system. This system needs to be reinstalled.

2, that is, the boot in the BIOS is not set well, which leads to the failure to start normally. Just set the first boot item and hard disk as the first boot.