Rafael
Hello there,
Sorry for the trouble.
Could you please send us a picture of SN code(two lines) at the bottom of machine ?
Here are some solutions:
1、If the DP port is 1.4 Version, please buy an active DP1.4 to HDMI 2.1 cable , the active cable is more compatible , here is the reference :https://a.co/d/dQPFCna
2、You can try to clear CMOS : Please turn off the PC , unplug the power supply and HDMI cable , and press the CMOS pinholefor about 10 seconds.
Ten minutes later, plug the power supply and HDMI cable, turn on the PC again.
Here is the tutorial :https://mega.nz/file/XypwTISY#DVT0BsjOgiPkZ-drQaj88JH9Z7f7qpKGP2E3nMHW8ms
3、Please uninstall the graphic driver in the device manager and install the new one.
Here is the driver file: https://url.bee-link.cn/UX3B
Here is the tutorial: https://buildin.ai/lizong/share/50c2dee7-dcde-4707-97d8-dc7eac84a4eb
Have a nice day~