Color Problem on Printer

My printer, HP 840C failed to print red and blue, it's only print yellow. I have tried to sink the cartridge in warm water if in case the ink is no longer fluid. A friend says used alcohol to help or hot water with detergent. Is it true?

Answer:
Is the cartridge new or old? Injection or original? Sometimes cartridge has problems on the nozzle, especially if it is a remanufacture one, or refill. If you have sink it with warm water and didn't help, you have to vacuum it.

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