There isn't a lot of ppl that do white ink printing so there's no white ink available. Ur best bet is to see if canon can help you with a white ink. The last time I heard, white inks were unstable after a few weeks.
Also, you can try printing off-white color only a few times on the same page to see if it looks like white and then print the other colors.
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Winchester 3200+ @2,500MHz
LeadTek 7900GT VOLT MODDED @ 680 core, 1800 mem
2x1GB Transcend DDR400 @ DDR454 2.5,3,3,5,1T
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