I am such a .... I plugged display into integrated card instead of separate one! No wonder it did not work! Works fine now! :D
Don't worry about it! It happens much more often than you think, especially when moving or setting up a PC.
Windows tends to prioritize rendering on whichever graphics device the monitor is physically connected to, which is why the system defaulted to the integrated chip.
If the cable was switched while the system was running, it is a good idea to do a quick restart of the PC. Rebooting ensures the motherboard properly updates its display detection, allows the dedicated graphics driver to take full control, and completely disables the integrated graphics to avoid any potential device conflicts in the background.
Glad to hear the games are working properly again! Best regards.