"Can you tell me why my printer won't print yellow?"

"Well first, it is a color printer? And there is yellow ink in it?"

"Oh, yes!"

"Can you print green?"

"Green works fine!"

". . . That printer only has 3 colors of ink, if you're printing green that means yellow is coming out..."

Tried uninstalling and re-installing printer drivers, changing cables, cleaning cycles, examining the print head, everything seemed to be fine...

"Oh, oh, oh! Should I be printing on WHITE paper?"

". . . Are... are you printing on yellow paper?"