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Inspect and clean high voltage power supply contacts. The HVPS contact springs mounts on the high voltage power supply PCA and protrude through the toner cartridge cavity to contact the toner cartridge. Verify that the contacts are not dirty or corroded, and that the spring action is functional. If dirty, clean using dry, lint free cloth. If this does not work, use a minimal amount of alcohol.
It could also be the HVPS. I hope that solves your Problem, If so kindly accept it. Thank You, Arjun.
The problem is that the cartridge you re using was reloaded with toner, but the remanufacturing process did not include replacing the chip. The ML2150 and the 2151N do not read the toner's chip on boot, but the 2152W does. So you either have to get a cartridge that has a new chip or get a new, genuine, Samsung cartridge.