HP Color LaserJet 2840 All-in-One Printer

HP Laserjet 2840. Added New Drum & 4 Toners (HP originals no third party toners) But Prints Only Blanks. I don’t know how to fix it so it’s been sitting in my room for about a year. Get it only if you know how to fix this or for parts, giving away "As-is" Multifunction printer, scanner, copier, and fax. Includes toner. Used condition.