This is a booting problem. Please see this video that we have made that will explain why it happens and how to get the problem resolved. Garmin GPS Booting Problems By SHARCNET USA
Booting issues can be caused by corrupted firmware & maps during the update process or when the flash drive becomes write protected. More information on booting issues can be found here: SHARCNET USA Out of Warranty GPS Digital Camera Repair Center
I have seen this issue while booting after doing a firmware update but it always goes away after the 1st reboot.
It's possible that your firmware is corrupted. I would try reflashing the firmware by using Garmin's webupdater, available on their website. It could be a problem with the video driver chip or LCD display but I would try the simplest thing first and reflash the firmware. Let me know if you need further help.
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