Have you tried resetting the device (you need paperclip to do this on the bottom of the device)?
Have you tried removing the SD card and re-inserting it?
If you go to the menu, click "Change Preferences", then scroll to "Configure GPS" and click it, you should see the GPS Status screen.
It should look something like the photo below, showing satellite signal strength at the bottom of half of the screen.
You should also see in the top right corner next to the time a black and yellow circle that rotates 80 degrees every second. It rotates every time a message is received from the GPS chip.
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