In case there is error or malfunction on the printer, then an attention blinker starts to blink on the display of printer. It is important to resolve to resume the Printing process. Check with all the network connections. When you’re HP LaserJet Printer prompts a message saying ‘Incorrect Print Cartridge’ or ‘Print Cartridge Problem’, then you’re printer is not in ready state to print.For More Details Dial +1 855-674-8450 or Visit www.123-hp-com-laserjet.com/