Engine don´t starts on PC when Prime4 is connected

I can´t start Engine Prime on my windows pc when it´s connected with Prime4. It opens shortly and closes suddenly. Somebody knows this problem - or better - a solution? Thanks.

Does it not need to be in controller mode to connect it to your laptop/computer?

What happens if you open Engine Prime and then connect the Prime 4 in controller mode?

Thanks JWiLL, I tried to do this but it failed. Then I tried another USB port a the PC and it works. Don´t know what happened but technic is hard to handle sometimes…