I am working with an HP InkJet CP1700 that was originally giving me printhead errors, stating that either printheads were missing or needed to be replaced (faulty). I purchased 4 new printheads & installed, but I continued to received messages that 2 or 3 of the printheads were missing. I then cleaned the contacts in the printer as well as on the cartridges themselves according to HP's Determing a Faulty Printhead instructions. I did not receive error messages about missing printheads after the cleaning, but I did receive error codes on the printer's display, accompanied by flashing power & paper feed buttons. I have received various error codes, but none have brought up any support information (that I can find) on the 'Net, nor can I find any error code info on HP's site. I have received the following error codes at various points: C0130F0D, C013160D, C0132645. The other odd thing is that some pages will print fine, then are proceeded by an auto-alignment sequence. Halfway througth the alignment, I will recieve an error code or be told to replace a printhead. Other times, only half a test-print page will print before an error code will blink at me. Sometimes simply opening and closing the access panels will reset the printer & get it printing a page or two again. Any help on this matter would be greatly appreciated.