HP Deskjet 990cxi Printer - Manual (Page 49)

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Print Cartridges: Damage Resulting from Refilling the Print Cartridges
Damage Resulting from Refilling
the Print Cartridges
To get the best performance from your printer, Hewlett-Packard
recommends using only genuine HP supplies for HP DeskJet
printers, including genuine factory-filled HP print cartridges.
Damage resulting from the modification or refilling of HP print
cartridges is specifically excluded from the coverage of HP printer
warranties.
Note: When buying replacement print cartridges, check the part
numbers carefully. The print cartridge numbers for your printer are:
Black HP 516 45 Series or HP No. 45
Tri-Color HP C65 78 Series or HP No. 78