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Hello, this is Harry from www.BusinessSpread.co.uk.
We had the exact same problem when printing, we used 3 different 78 colour ink cartages and they all said 100% full but did not work. We then had a look at the dates on the box and they were all expired so when buying ink from anywhere even PC world or Curry’s always look at the expiry date.
Today I went to PC world and purchased a new 78 ink which said expires July 2011 and it works perfectly fine.
When I printed powerpoint documents on a hp deskjet 1280 it failed to print lines. I found that this problem could be solved by changing the transparency attribute of the line to 50%. The transparency attribute of a line or shape can be found by clicking on the sequence format/shape-outline/more-outline-colours/transparency at the top of the screen
You have either a clogged colour print head or a non-functioning print cartridge (only one colour working). If the printer has separate cartridges for different colours (and black) you can do a partial swap, replacing the ones that have failed, but start by running the command CLEAN PRINT HEADS from the printer options or controller panel, and watch for the quality to improve. You may have to clean the heads two or three times. If no change in the quality after two flushes, replace the cartridges with new ones.