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unplug the fuse for the navigation/radio for about 10 minutes then plug it back in. that should reset it. before you do that make sure you know the code to activate the radio and how to enter it (if it requires a code).
if you can't locate the fuse just unhook the battery for that length of time.
When you turn on the radio, it will say "codE" on the display. You have the 4-digit code number for your radio, to enter the first digit, press the "1" button on the radio the number of times until the first digit matches. For example, if your code is "2156" then, press radio preset button 1 two 2 times, then press radio preset button 2 one time, then radio preset button 3 five 5 times and finally preset button 4 six times. THEN if the display is correct (should show 2156 in this example), press TAPE button. You should hear a beep and the radio should be working. If you make a mistake and enter a wrong code, the display will show "Err". You have 3 tries to get this correct or the radio may be toast. These are the steps for the stock radio in my 1995 GSX and they've worked for me each time I've lost battery power. Good luck!
ouch thats a pricey one you have to replace the head unit there is no lock out for the buttons so if they dont work its a mechanical failure and its all one seald unit screen and all and it costs just shy of 2500.00 dollars