Hi all

I am new to this but I need a bit of help please? Our tv was working fine yesterday I never noticed anything different about it and switched it off as normal last night. When I switched it back on this morning, it came on with the green light at the front as normal, then it changed to solid red. It's working fine, I can get guides up etc but this light is normally green? I have searched the internet for any ideas but all the discussions talk about a blinking red light, and mine stays solid. I have an 8 year old son and I'm wondering if he has pressed something by accident? Any guidance appreciated!!