Input not Supported Blackscreen, had to restart PC in Safemode
The issue is likely the available resolutions for the monitors attached , in windows look at the largest available resolution it is likley unsupported by the monitor
unfortunately swtor looks at what the system says the monitor can do and try to launch initially with that resolution
either change the monitor or connection method etc , or try updating the video driver if it is oldish , and lastly you can create an override with cru https://www.monitortests.com/forum/Thread-Custom-Resolution-Utility-CRU
just allow the native resolution of your monitor etc like 1920 x 1080 60Hz and then launch the game
edit: once the game has launched , you can check the client_setting per https://answers.ea.com/t5/General-Discussion-Technical/Guide-Game-failing-to-launch-on-Clicking-Play/m-p/4809830/highlight/true#M70795
