try different combinations of removing the sim, restarting the phone with and without the sim, restarting your computer, etc. one of the key rules to modding phones is to keep trying different angles (especially with restarts) until you find a hole. don't worry about this...you are in no risk of losing your phone...it still works fine...you just need to work out a few kinks in the process...
one more thought...did you restore the phone with your SIM in or out? try it with the sim out...that's a great way to get it back to factory condition.