camera buging out on me

i clicked one button and all of a sudden my screen goes gray. now whenever i get on unity the scene is completely gray. i need help (first time user)

Well, I have had problems like it. I am going to guess that you only have one camera in your scene. If that is the case then select your camera in the Hierarchy ( it probably is not visible in the scene). Next, check in your Inspector. At the very top there is a box to the left of your camera name. Click on it and a check mark should appear. Now you should get a camera preview window in you scene window and if you hit play you should have a camera view.