I have bought laptop thinkbook 15 g2 Itl with 40 GB ram, Intel core I7, Intel iris xe, and ssd 1 TB. I have connected it to an external monitor Dell Ultrasharp U2422HE and installed Ubuntu 20.04. 3 LTS desktop from a USB stick. After restart at the end of the installation the laptop didn't switch on the display and only CAPSLK, NUMLK, and ESC (funclock) buttons are enlighten on the laptop. After some seconds only ESC button stays enlightened and then the laptop is automatically restarted. And this continues until I press the power button long to switch off the laptop. I tried to press the Novo button but the display is still off and the laptop again restarts. I have tried any function buttons combinations without success.
Can you please help me sove this issue?