Can i only print in black and white on my pixma mp250?

First, are you running low on those ink colors? If not, possibly print cartridges need cleaning. If printer has separate print heads, they made need cleaning.
Lastly, print head(s) may need replacement.

replace both cartridges to fix this problem. The machine uses both cartridges in the printing processes.

the nav screen display has gone bad

Press and hold the red Stop/Cancel button for 10 seconds. This will help by blocking ink level detection.

open the snanner lid in printer powering on then the cartridge cradel will move to middle then open the both color and black cartridge and look the down side of the cartridges you will look some glazed white part .that is the print head which is metallic thin plate.when electric apply on it it heat and melt the ink and create some vaporize condition in the cartridge then air flow from the cartridge and spray the ink on paper.

Press Setting button on your computer four times, your printer display "u" and then press black/color. The printer start to print one page. After printing the page put the paper on the scanner port and press black/color... that's it ..... thanks

Yes, there is: in Printing Preferences , in the first tab, you have the Grayscale option - select it.

Problem in re- fill cartridges canon mp250 pixma

Mostly, printer cartridge error occurs when the printer head is unable to identify the cartridge properly. And the basic reason behind this is that the cartridge is improperly attached. To reattach the cartridge, turn on the lid of the printer and then remove the cartridge from the printer head. Check the cartridge to make sure that there are no scratches or other damaged parts that can contribute to a printer cartridge error report. Take note that the cartridge should not be left open for more than 30 minutes; otherwise the ink will start to dry up and the cartridge will get clogged.

Canon PIXMA MP250 series serves with PRINT + SCAN + COPY function. No FAX function