HP Deskjet 3740 on Windows 7 32 bit has operated well for years, but suddenly it does not recognize there are two cartridges installed. Advanced properties only provides two options: 1 black cartridge, or 1 tri-color cartridge. So I can only print in one or the other, but not both. Have removed and reinstalled the printer, and replaced cartridges, but they don't help. Seems okay otherwise.
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