New member so sorry if posted wrong. Also, pretty sure this has been asked and answered many time before so I apologize if its redundant. My problem is this. I bought a brand new HB 899SI. Took it out on the water and it was working flawlessly for the first 5 minutes. Excellent DI and SI images. But then, suddenly, the unit switched to switch fire sonar and I could never get DI or SI imaging back. Just white out where these views should have been. What I mean by white out is, the window and borders are there, just no image at all. I restored to default settings, turned power off and on, and went through the menu settings so many times I got pissed. Anyway, anyone have this problem or know what it is?