try deleting the gmaptz.img file, reset and reboot.
https://www8.garmin.com/support/download_details.jsp?id=4747
nothing is working and i'm still going round in circles, any offers for a new, albeit completely dysfunctional, garmin edge 500 to have a fiddle with?
do you see the device when plugged into a laptop/desktop?? if you do remove the suggested file and reset the device.
@tmevans started
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try deleting the gmaptz.img file, reset and reboot.
https://www8.garmin.com/support/download_details.jsp?id=4747