I'm experiencing periods of no color print. Removed and cleaned print head, cleaned purge pads and was able to print 6 of 13 (8x11)pages of plain paper color prints (8 photos per page) successfully. The 7th and subsequent pages had no color. I cannot imagine that the printhead became clogged again during the printing process. I use canon ink and the ink is full. My next step is to inspect the purge system more closely but I am unable to remove the bottom cover to gain access (found the back two screws but the front is still secured. Any suggestions would be appreciated.