Can anyone please help, I have just bought a second hand ET 2710 ecotank, it won’t print anything, I have just checked the waste ink pads and they are bone dry so no ink has reached them, I have purged all the inks from the main tanks to the inner ink cartridges and cleaned all the nozzles by putting ink cleaning solutions through them and they are all clean, ( no dried ink in them ) it connects to my laptop ok and it goes through all the printing sequences but all pages are blank, I’ve even run a 3rd party purge and no luck, any answers most appreciated I am at a complete loss.