Hi, I have a kodak DC4800 for almost 5 years. I take 5000 photos with it. With no know reason (no shock), this week when I started it, the navigationnal button (directionnal button with arrow on it) don't work any more for all direction. I don't know if the problem is hardware or software. The button mecanism still working very smootly like new. I buy a new battery from Ebay a month ago. It a 1500mah li-ion For Fuji NP-80 batterie. Cell from Japan Made in China. I use the camera a few time only since then. So I suspect that may be the battery could put it in this problem. First, just for testing purpose, I try with my old battery, an old memory card. It don't still don't work. I spray air around the button. it's don't correct the problem. I also spay an electronics part cleaner around the button with no success. I could not think about a factory default reset but I could not reset it because I could not navigate thru the menu to do it. I could not do a firmware update for the same reason I could not answer to confirm the firmware update from the camera menu. I try it but could not pass thru the menu questions with no working directionnal button. I think for a silent mode firmware update but found nothing about how to do this. The camera is in a working condition but I could not change any setting or view and delete photo, etc thru screen menu. I could use it has it but I loose options I like to use. Is someone had the same problem? Is someone know if it's a software or a hardware problem? Does someone know how to do a firmware update in silent mode (no question - no answer just update) with parameters... I can map the memory card with my pc with no problem. I could unchek the directories and files read only checkbox but is reset by the camera (files and readonly mode)... I'm not shure that I want to spend on repair.. Does anyone know how much it cost. I read 0 on a post done few years ago. Could you give me more up to date cost. I know there are some kodak support guys who follow theses posts. I will appreciate your comments about this problem. Louis Dinel [email][/email]