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If you have been useing tap water rather than distilled water then most likely it is plugged up with hard watert deposits. The only real solution is to disassemble it and manually clean out the hard water deposits. I am sorry but this is not going to be an easy job.
So I guess it's less expensive and time-consuming to buy a new one. Do you agree?
you can try running some CLR (calcium, lime, and rust.) through it but if it is already plugged it probably wont do much good. You can get CLR at any supermarket in the detergent section.
Unfortunatly I must agree.