Digital BW, The Print

I did not use my Epson C86 for about 6 months. When I resumed it 
yetserday, the 3 EZ cartridges were empty (the Epson black cartridge 
was half full). I replaced the empty cartridges with 3 new MIS EZ 
cartridged, but after 1 cleaning cicle and 24 hours nothing comes out 
from the clogged nozzles. Do you believe my C86 is irreparanly damaged? 
Is there anything I can do to have it work again? I believe I saw it 
posted on the forum that going through many cleaning cycles may spoil 
the heads. Thanks.