I bought an 1198c and powered it up to only a white screen and ended having to send it back and had a new working unit within a few days. The thing about Humminbird is the service is great and will make things right quickly. So don't be too let down. the Lowrance service department is terrible. I had an HDS 10 and side imaging unit and had problem after problem, and could get little to no help.... ended up returning it and went back to humminbird. my friends also broke and it took 6 months for lowrance to get it back to him and it worked for 4 more months and quit and now in trash and replace by Humminbird. So it could be worse. Hope im wrong but it sounds like you may have a bad screen as i did. Good Luck.