Yesterday, the win7 patch and vulnerability were automatically restarted, and there was a digital signature problem. I can't start the machine, I want to go into safe mode. What should I do?

You can try clicking F9-Enter-F 10-Enter in the BIOS interface. If you still can't get into the system, please change the BIOS settings as follows:

1. Press F2 to enter the BIOS interface when booting, enter the security menu through the arrow keys, and select Safe Boot through the arrow keys.

Control options and set them to disabled "

2. Enter the startup menu through the arrow keys, and select the lunch CSM option through the arrow keys to set it to "Enable".

3. Click F 10 to save the settings and restart the computer.