Espresso will not come through my Saeco Gra...

I have had this machine for some time, about 8 months ago the water was not coming through the coffee...thought perhaps it was ground too fine but that wasn't it...realized that I had not descaled it so I did and cleaned the portafilter and it seemed to work fine since until now. So I descaled it again but to no avail...thought it might be the portofilter so got a new one but that did not help....once heated up I try to make an espresso, you can hear the pump working but nothing comes out!! I am so frustrated, I love this machine and miss my coffee!!! I use a French/Italian blend of beans from a local roaster...maybe the beans are too oily and have clogged up things..what should I do can you help me!!!