That seems odd... Have you first look if your PC computer meets the minimum system requirements of the game. But it seems the gameforge launcher you installed is working... cause you said you clicked repair 3x times. But after you clicked 'play button" of the game launcher and it show "In game" next... thus you see a "Tera" "Gameforge" "Bluehole" logo loading screen after that?
But to trouble shoot check each one of this
1.) You first download the tera game installer from gameforge. (It's a very small file that will connect to the gameforge server once you click it to install).
2) click install it only took 2 minutes to install the launcher not yet tera game.
3) click install tera from the launcher, You wait about 1 to 2 hours to download and install (depending on the speed connection of your ISP) and the capacity of your system requirements of your PC. when installing. it usually slows down when installing cause it also is installing some of it's file in the appdata of your windows. besides the folder you chosen to install.
4) wait till the play button show up in the tera gameforge launcher that how you will know it finished installing.
5) restart your computer windows after install cause some of it's file from appdate wont load yet when play button is pressed.
6) after the windows have fully restarted blah blah blah... and you see the gameforge launcher icon on the desktop besides also the Tera icon and clicked Gameforge Client to run you will see now the play Button of the game launcher.
7) when you click play you will see a loading screen of Tera with a picture and a logo of gameforge on the lower left and bluehole logo on the lower right.
then a bluhole starting animated screen will show followed by a warp screen after that.
9-a) then character creation after that if you have not created any character yet
9-b) if you already have created a previous character before ( and just reinstalled a game launcher again)
9-c) if all the 1 to 8 is checked and game having problem launching, update you windows OS cause sometimes this thing might also bug the game from launching properly or you pc just dont meet the system requirements needed to launch the game properly.