most likely is the battery is replaced wrongly , check the polarity is correct

it has a fuse on the main board that seems to blow easily , if it's completely dead that's probably it , a factory repair costs more than a new printer, don't use the cleaning cycle on these more than once it uses a lot of ink and then clogs the nozzles worse than before

you have the density set to a positive number , anything but pure white is then interpreted as pale blue or grey