Question about HP Officejet 7210 All-In-One InkJet Printer
Remove all the ink cartridges, and then unplug the power cord from the back of the printer.
Now, hold down # and number 6 button together, and while holding them down, plug the power back in.
release the hold after about 30 seconds, or the display saying nvram reset .. something like that .. If the printer turns off , then you will have to turn it ON again .. and then insert the ink cartridges ,
this will reset the machine.. and should resolve the issue. Also check if yu have any old cartridge and first insert that and see. if no error on inserting the old cartridge and that if it come by inserting the new on, then it could be the cartridge problem. Will have to try with new ink cartridge.
Posted on Sep 07, 2010
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