It's now worse as the lights are the same (power and resume lights flashing) plus all the ink tanks are on steady. Note that the ink tanks on the K8600 are not on the print carriage, but are behind a cover on the right of the printer body. Are we talking about the same printer?
The ink cartridges are generic, and I am sure that they cannot (all!!!) be empty. If I power cycle the device, it comes up correctly with just the power light on steady. After I send it a test page from the PC (prints fine), the power and resume are flashing and all four ink lights are on steady.