Doesn't sound like a problem to me if it only happened once and it's normal now... could just be a software glitch.
To check the monitor - you can place the Nav system into a test mode by:
1) Turn the ignition switch to ON
2) Press the "OK" disclaimer
3) Press and hold the buttons in the following order:
1) MENU
2) MAP/GUIDE
3) CANCEL
keep them pressed for 5 seconds.
Select Monitor Check and check the RGB Color, Test Pattern, etc... I would stay away from some of the functions, as you could adjust something that's meant for Manufacturer use only.
Regards.
Rail
To check the monitor - you can place the Nav system into a test mode by:
1) Turn the ignition switch to ON
2) Press the "OK" disclaimer
3) Press and hold the buttons in the following order:
1) MENU
2) MAP/GUIDE
3) CANCEL
keep them pressed for 5 seconds.
Select Monitor Check and check the RGB Color, Test Pattern, etc... I would stay away from some of the functions, as you could adjust something that's meant for Manufacturer use only.
Regards.
Rail