No signal on tv. My husband sat on our cable remote and now all we get on the screen is "No

Question

My husband sat on our cable remote and now all we get on the screen is "No Signal". At first the yellow cable light was off on the cable box but I was able to get that back on - when I turn the tv off and then back on all I get is a small box in the upper right hand corner that says "AVI" and then it fades away and up comes the no signal message. I have tried using the input button on the tv remote, but it does not change. This is not the first time that this has happed but it's been I think almost two years since I had to get assistance. Any ideas would be appreciated. Thanks