A common issue is after creating a password on your Blackberry device, when you attempt to synchronize with your computer and the Blackberry Desktop Manager requests you type in your password, it rejects the password that you enter.

If your password on the Blackberry device is made up of all numbers, do you press the ALT key when entering the password? If you don't, then your password is actually the letters corresponding to the number keys you enter on your Blackberry device. Determine these letters and try entering that as your password in the Blackberry Desktop Manager.