navigator 6

Hi guys. I recently purchaseda plam treo 750, and also tomtom navigator 6 with a tomtom reveiver. I installed it all and it worked great...............for a few days. Now all I get is "no GPS device" I have tried uninstalling and reinstalling the software, deleted and remade the bluetooth pairing, played with different com ports etc. Nothing has worked. Is there anything else I can try? It's starting to drive me insane as it was working fine for 3 days and now it doesn't want to know.
thanks in advance
daz

Install that again and than try that will work.