How's it going Nomis? What have you done now..
First off...is the device activated on the wireless network? Simply pop out the SIM card (very carefully) and replace it and observe the screen for the security verification/validation.
If all comes up well without error messages...then that's good
Ensure that the wireless radio is turned on (hey...you never know)
How long ago was the account setup with the activation password....try resetting it (there's a timeout for the setup - 48hrs max I believe)
If still no go, then I would do a wipe/load of the device (as a last resort)
Let me know how it goes..