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[arpsoft 12]

Azért van rá megoldás:

 

All I did was change the Boot mode from UEFI to Legacy and it started showing boot scrren on external monitor. Again this was tricky and had to be done blindly.

Here are the keystrokes:

First shutdown your laptop.

Now press Novo button (small button besides power button) to turn on laptop and follow keystroke as follow:

'down arrow' 'enterkey' 'right arrow' 'right arrow' 'right arrow' 'enter key' 'down arrow' 'enter key' 'right arrow' 'enter key' 'enter key'

Now your laptop would reboot and show boot screen on external monitor.

Forrás: Lenovo fórum