So i just bought a black ink cartridge for my hp printer. I left for the weekend and when I get back my comp shoes that the cartridge is empty and when i printed something it looked horrible. I have a feeling either this kid down my hall switched ink cartridges ( because i know he was out for a couple weeks) or someone used my printer while i was gone by plugging in their laptop. Is there anyway I can check this? I am really pissed off because they are pretty expensive to replace. Thanks.