Digital BW, The Print

I also live in an area of low humidity (New England in winter) and sufferred a clogged yellow nozzle. Cleaning cycles didnt help. Cleaning solution from inksupply.com did not help. I ran the print head over some paper towels with windex/water solution (1:1) but i was sloppy. The paper towels bunched up and it was hard getting them out from under the "paper jam". Now I went from a clogged yellow nozzle (with about half the jets missing) to an absolutely blank nozzle check print out. NOTHING SHOWS! 

I turned the printer off, disconnected usb, reattached power but left usb disconnected. I tried printing a nozzle check the 'hardware way' by holding the button with the 'page icon' and turning the printer on. Whereas before i would get an almost complete nozzle check pattern, now i get an absolutely blank page.

Is it possible to damage the print head from a paper jam? Obviously, something is dreadfully wrong. Did I clog all the nozzles with paper towel shreds? I removed the cartridges and the nipples all flush easily with cleaning solution from ink supply. No mechanical blockage. Still no nozzle check pattern even after several cleaning cycles. I really goofed. Is there anything to do to save this printer before throwing it out?