Not an answer ...
My x3480 is 14 months old and I got the same error msg on replacing a cartridge.
Obvioulsy a common fault, see Brimar in answering the same problem from S Bell July 08. Also check out R Crisp Jan 08 and Noor Jan 08. And on eBay today, there is someone selling an x3480 for spares or repair as he gets the msg "cover open".
This should be repaired or replaced by lexmark as it is a DURABILITY problem. The warranty period is not relevant in this circumstance. They should act responsibly if something breaks within the 'reasonable' life of a printer. But what is the reasonable expected life of a computer printer? I'd say 2 to 3 years, and that's how I'm going to approach Lexmark. Watch this space.
Alan, July 2008
