I am not understanding your statement - "shows up fine in Windows (with another graphics card) and load the driver."
What do you mean exactly and how do you determine this?
Are you running the board as pictured? If so, without heatsinks, the components will likely fry in about 3 seconds.
Anything that stops the GPU from generating the video will kill all the connections. That could be a Power, RAM, or GPU failure. The driver might still load into the GPU or another device on the board.