Epson Stylus DX4850 won't print after leakage?

Hi, Hope you can help. Last week I decided to do a collage of all my pictures. I managed to colour copy loads of old photos, replaced the ink cartridges, copied some more, printed lots that I had saved on the PC, then wham....I got a full page of ink, which ran everywhere. I tried printing again, same result. One cartridge was almost completely empty within minutes. I then tried printing text but in different colours. Nothing printed. The printer sounds like it is working, but prints nothing but blank pages. I've now bought more ink, done numerous and countless head cleans etc, replaced every ink cartridge and it prints absolutely nothing! What can I do next? I'm not technical, I've had the printer for about 18 months and am gutted that such an expensive item for a home computer has packed up. What can I do next?

Thanks

Pam