Is the scanner off? It should be. Sounds like the SD card has been corrupted. First, turn the scanner off and try reseating the SD card. Try removing the SD card from the scanner and putting it into the card reader slot in your computer. Do you have a backup of the configuration file in the scanner? If so, try going to the Scanner/SD Card tab in EZ-Scan and click on Prepare Scanner Memory/SD Card for use.