the reference answer GPT ᴼ ᴾ ᴱ ᴺ ᴬ ᴵ < br / > if your ThinkPad E480 after installing the number keys 4 appear black screen and unable to recover from a dormant state, you can try the following solutions:
- Restart the computer: Try to restart the computer first, sometimes this problem can be solved by restarting the computer.
- Enter Safe Mode: Try entering Windows Safe Mode, which will allow you to determine if the problem is related to installing the number key 4. In safe mode, you can try to uninstall the number Key 4 driver and restart your computer. If the problem persists, you can try a system restore or reinstall the operating system.
- Restore BIOS Settings: If you changed BIOS Settings before installing number key 4, you can try to restore BIOS Settings to factory defaults. On the ThinkPad E480, you can press F1 to access the BIOS Settings screen.