Similar thread a few weeks ago and I gave a similar answer too.
Don't get your knickers in a twist just yet. Get some head cleaning cartridges from a "compatible" ink supplier and let them do their stuff. Your heads, sadly, are integral to the printer I think, so cartridge replacement will get you nowhere. The cartridges are charged with a solvent that will seep through the heads overnight and when you switch on the printer afterwards, it will pressurise and hopefully blow the crud away. Once you are making some headway, get printing! A long tome or two will loosen the blockage even further and hopefully restore your printer to full use. You have nothing to lose.
Google for ink cartridge+cleaner+uk
With ever greater resolution from todays printers, the nozzles get smaller and so the blockages occur more easily.
Let me know if I can help further
Conan