I am having a problem in my digital printer Konica minolta Bizhub C 350,?

I have been using my machine all most a year now fistrly i faced hard disc problem, then i was adviside to format it and i did it successfuly. but now machine is down and it gives me an error code C 0400, am geting comfued and i realy dont know waht to do then. anybody can help me please!
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