Lexmark C750 - Change <X> Invalid Refill; Check <Device> Connection; Clearing Job Accounting Stat

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Change <x> Invalid Refill
What this message means:
The printer has detected a refilled Prebate cartridge.
What you can do:
Remove the indicated print cartridge and install a new one.
See also:
Replacing print cartridges
Check <device>
Connection
What this message means:
The specified device is either not fully connected to the printer or is experiencing a hardware
failure.
What you can do:
•
Reestablish communication by removing the specified device and reattaching it to the printer.
• Press Go to clear the message and continue printing.
• In the case of a hardware failure, turn the printer off and back on. If the error recurs, turn the
printer off, remove the specified device, and call for service.
Clearing Job
Accounting Stat
What this message means:
The printer is deleting all job statistics stored on the hard disk.
What you can do:
Wait for the message to clear.