Same thing happend to me last week. 999ci HD SI, bought new with a new boat in Spring 2014. It just failed. 2.5 years old but only 70 hours of use. Pretty poor reliability for a $1,500 unit. Humminbird now wants a flat $322 plus tax to repair it. I would not recommend this brand after this experience. Was always kept covered when not in use, etc. Disgraceful.....