I don't know anything about the T50, but yesterday I fired up my Epson R800 which I have had since the days of film cameras. I had to run the head cleaning routine several times to get the ink to flow, even then blue is not working and I expect I have to replace the cartridge.
I use PS, CS3, and I still get all the usual menus about the paper, etc popping up.
Don't know if this helps.
Twin E-620/70-300mm/14-42mm/pinhole lens, plus 8mm FE, Tokina AT-X 90mm macro, and Zeiss 500/8 mirror.