nissan primera se radio code?

I have got a Nissan premira se 1.8 patrol 2004 year.
I have been using this car for 5 years but suddenly last week my radio, cd nothing is working. on screen it says secure. I have looked for code on manual book but there isn't any. so could you please help me out. your help in this matter is much appreciated.
Thank you

Ishwor Gurung
January 2016