Revealing mistake: As the bridge crew monitors Psi 2000 on the view screen, a glitch in the special effects matte makes the planet vanish briefly and then reappear - twice. (00:12:30)
Revealing mistake: As Spock gets to to the helm position, the whole console visibly wobbles as he hits the controls.
Answer: After causing Norman to overload, all of the other androids shut down. The same could be said for the androids on the Enterprise.