Remote Control Pause, Ff Buttons

When pausing a program with the remote, the tv turns black. When I want to play what I paused, all I get are what look like pixels and then some horizontal green lines. It won't start to play from where I paused it. If I fast forward it to where the program is actually playing, it will work fine. Can't go back during a program either - same thing happens. I have replaced the batteries. Began having this problem two days ago and have tried everything suggested on your website. Channels, VCR, etc. work fine.