I would try connecting my brothers pc to the tv but his computer doesnt have a hdmi slot. I dont think its an issue with the tv though because my ps3 still runs through it fine. I would try updating the gpu driver but seen as i dont have any form of a screen in my house that my computer will connect to i havent got a display. I literally switch the pc on and wether its connected to the tv or the lcd screen they both say on the screen no device connected.