Stuck on level 2 missions

[Destructor]

I am on the mission to create a music link. I already have a power source but it won't let me activate it. When I try to buy the speakers and hardware needed the game tells me not enough power. Ive purchased coins trying to make it work and no luck.

[xGEKKOx]

Hi destructor, sorry for the late answer.
Before upgrade power,mtry to downgrade something else, after upgrade power, after re upgrade the downgraded slots.