My garmin nuvi 880 is dead, It just turn on only plug into my computer but it displays the slash screen only and stay there forever. My computer is window 7 is not able to see it at all even though I install USBDrivers_231. The updater.exe can see it as usb device in Pre-Boot Mode only. WebUpdater_WindowsXPSP3andnewer__256, my Dashboard.garmin don't see it at all. Don't know what to do. Please help anybody.