is your internal IP set to a static ip ?
if no have you checked what your internal IP is you can check this with a command prompt and type " ipconfig " or to get the full version " ipconfig /all "
then make sure your port forwarding to the correct IP as if your using dhcp for your network your internal IP may have changed.
Thanks for the input guys. I managed to sort it out by setting the detent line. Alt-I did not work because I had selected the detent option under hardware. Up and flying now- thanks for the help:)