I found a solution that got mine back up and running. I had to use a Windows PC to get this going, but it works now!
- Pull the batteries and other external power sources, then put them back in.
- Go to the Garmin site to download the manual software updates: http://www8.garmin.com/support/blosp.jsp and download the appropriate file (not the web updater)
- Extract the update to a folder. By default it will go to C:\Garmin, but you should put it somewhere else if you've already installed Garmin software.
- Have that folder open, and have the updater.exe file ready to open
- plug in the USB cable, and on the GPS, hold the directional key in the up position along with the power button and do not let go. You will need to hold them down for several minutes
- run the updater.exe and you should see your GPS under USB. Let the update finish.
- I got an error message after it completed, but the unit now turns on and is fully functional!
I got the idea from this site: http://brilliantcorners.org/nodes/87-fixin...in-gpsmap-60csx about a different model, but the procedure worked for me.