When I run Ai the screen is black.
This generally happens when Ai is run on a system which does not meet the required specification for the graphics card – often this will be due to an Intel graphics chip with shared memory.
Unfortunately these are not supported in Ai as they lack some of the higher functions required of the GPU that Ai makes use of. If you do have both a shared and dedicated GPU in your machine, make sure that Ai is set to run on the dedicated GPU – this can usually be done via the control panel for the graphics card.
Please refer to the minimum required specs for further information.