Hello and thank you for your question today.
I am very sorry to hear that your Garmin GPS device has faulted as such. In this case, it appears that the firmware has become corrupt for some reason. The way to fix is it to install the application named Garmin Express and update the device. You may download the aforementioned application from the following page: http://software.garmin.com/en-US/express.html
After installing the software, open the program, plug you GPS device into the computer, and choose to Update the Software on the device. Once that completes, you will be all set.
I look forward to hearing your feedback concerning whether or not your problem is fixed.
I hope to hear back that all is working. If this is so, please do not forget to rate my help on the top of this page (choose the number of stars and click the Submit button). If it is not, please respond below.
I will be standing by,Jason
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If you wish, I can remote into your computer and help you do this. If you want me to do so, please click the Accept this Offer button for the Secure Remote Assistance session. It does charge another fee, due to the fact that it will take a bit more of my time; however, that will be the last and final charge.
I look forward to your response.
I am very sorry to hear that. At this point, it appears that the device itself is faulted and will not be able to be repaired. Is the device under any type of warranty? If so, it is time to contact the warranty holder and request a replacement or repair.