Beginning in the summer I started having issues with my Garmin Edge 800. A few tracks were corrupted but I was able to download them using Topo Fusion, so it wasn't a big deal. SportTraks, none of those files would load so I have a big gap there that I am not sure how to fill.
After my early morning, Oh Dark Thirty Ride Before Work on Friday, I turned off the unit but when I tried connecting to my commuter it would start up and hang on the first screen. I looked it up on the web found out how to force it into Mass Storage mode, where you hold the power key and the lap/reset button and then let off on the power and it goes into disk drive mode.
Saturday morning I tried the master reset based on what Garmin recommended you do and why: