I acquired the xerox phaser 6180 and the color toners are empty and the black isn't. I want print only in black, however the printer won't let me. The display screen tells me I have to replace the empty color toners. Do i have to replace color toner to only print in black or is there a work-around? I already tried removing the color toners and leave the black...it didn't work. Is there a software update to correct this? Please help.