Toyota Navigation System (tns 300?)

[z-tune-z2]

Sorry if this is a bit cheeky, but the Family sub forum I posted this in seems to be dead, apologies if this is against the rules! Was wondering if you guys could help me with this...

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Hey, I know the TNS sucks and that in comparison to other sat navs it has no chance, however my parents only ever need the use of a sat nav once every few months, so they stuck with what came with the Previa in 2003!

After having worked for several years, something has gone wrong. Upon turning the electronics on, the TNS screen flashes up and should proceed to ask the driver to press enter to continue. However in our case, it flashes up, and stays up (I waited for 10 minutes). Afterwards I pressed some buttons and got to the CD track display, all is normal there, tried pressing the sat nav button again, same process happened, TNS comes up and stays up!

Anyone have a clue as to what has happened to it? I'd try an update using the disk that came with the car, but upon opening the case I found there was no CD inside. The case was sealed in a plastic bag too...

Thanks in advance!