I have 1 room that will be my theater room in my house, and for all the outlets in this room, the grounded light on multiple surge protectors doesn't light up. If i move those surge protectors to any other room in my house the grounded light is on. I took off the wall plate (after turning off the breaker for this room) and checked and there is a copper ground wire coming out of the cable run to the receptacle box along with the black and red wires and that copper wire is secured to the ground screw on the plastic box for the outlet . Why would all the outlets in this room act this way when they appear to be grounded? Is there any way to fix this or do I just need to replace it with a GFCI outlet from what I have been reading?
Re-reading your post, the ground wire should be connected to the grounding screw on the outlet, not the plastic box. Plastic junction boxes don't need to be grounded (they're not metal, after all). The lack of a ground connection on the outlet itself is why the surge protector is showing an ungrounded connection, and the 3-light circuit tester would show an open ground as well.