HP Deskjet 5150

I recently put a new black ink cartridge in my HP Deskjet 5150, and it worked fine for 2 days. Then my color ink cartridge ran out and told me there were "Pen problems." So, I bought a new color ink cartridge and installed that. When I installed it, it ran its usual check, then I ran the clean option. Today I went to print something, and I got "pen problems" again. What can I do to fix this? Did I install the cartridges wrong? I really need my printer!