Nissan Almera Tino Radio problems

I have a Nissan Almera Tino that has a radio that doesn't work very often. You hear a sort of deep click as though it has come on and then the control panel lights up and you can then switch the radio or CD on and all is fine. Then another day you will go back to the car and all you get is green panel that says Secure and this can last months before you hear a little pop or click and then it works again.
Any ideas would be great as it seems it is impossible to put another radio into this car.
 
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