Wanted to install these new ink cartridges and it says "The right cartridge has a contact problem." I swapped them out and then it just says "The contact on the left cartridge is broken broken". Uninstalled and reinstalled several times to no avail. Unfortunately the "90 day guarantee" is currently expired so I guess I'm just unlucky even though the cartridge's expiration date is 6/13/2020. What a terrible deal! It used to be expensive, but now it doesn't work! I will definitely NOT be buying from this company unless you need them installed IMMEDIATELY and it is within the warranty period.