We have had the same problem. There are 3 recessed micro switches that are engaged by a flange beneath the top cover. Our problem was caused by one of these switches being jammed down.
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there are a couple of things did you buy genuine or reman cartridges and check if they are seated properly.
some remans dont work properly so you have to be sure and always get a money back guarantee from the seller
Two possible solutions remove the top cover (Two screws on top after oepening the cartridge door and two push in black nylon screws in either side). and check the activation lever that activates the cover switch is not riding on top of the switch. Second if this happened your toner cartridge make sure this new cartridge is the correct one for the fax and not a HP modified recycled printer cartridge.
The error keeps flashing and the machine will not work. The error reads, "check cover/cart". We put the cartridge in and out about 10 times and the same error message keeps flashing. the fax machine is still not working. Help!