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?

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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