argh.. I live in the middle of nowhere as far as retro computers go.. I don't know how I am gonna get it repaired. do you think the denise chip not seated correctly would cause the wavyness of the video.
First step is to clean it up. Sometimes that can be enough. It looks like there's some corrosion in the Denise socket. Pop out the chip, clean, and put it back in. I don't think it's likely that Denise alone is the cause of your problems, but it's possible.
also that corrosion is 10 years old at least.. what can I do about that? alcohol and q-tips?
Yes, alcohol and q-tips. Acill (a user on this forum) can undertake more serious repairs if that ends up being necessary. I am assuming you are US-based. There are a few others around the world who do board repairs as well.