Epson Stylus DX 8400?

I don't have a problem but thought I would use this forium to find out how to bypass the 'Change cartridge warning in the display window on the printer.
Only one needs changing and can't affor cost yet.
Is there away to overided the command as I only want to print in BLACK and cartidge is ok.
Thanks in advance.
yes I know it a repair forum but can't find anything I can understand. I won't go in to programe areas I may bugger up the laptop the printer is connected to