E 18 problem

The lens on my Canon digital camera will not close... i am unable to take a pciture and do not know the reason for this....when the camera is put on i am able to see my old pictures but when i click to take a new picture the screen is blank..i dont know what to do...please help...i have the canon power shot sd 500 camera and the problem that appears is the E18...... please help me
I have a Samsung Digimax L60 and the lens wont close. The camera works fine...it just makes a clicking sound when it turns on and off like it wants to close the lens. What could I do to get the lens to close? I've tried turning the lens but it doesn'ts seem to budge.