Have your manual from link below
http://www.navman.com/Navman/Templates/productinformation____69925.aspx
Reflash the gps, or update your maps and you should be set! if nothing seems to work send in for warranty, what options does ur gps give you for connecting it to a pc or other device?
SOURCE: Navman S50 wont boot
Goto the navman site 'www.navman.com.au' and download the service pack for navdesk. this will fix the problem
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