We have a Konica Minolta bizhub 250 All-In-One Laser Printer and somehow we disabled the network connection and now the printer doesn't allow any connection to it through the network cable even if

SOURCE: konica minolta bizhub C252 printer Problem

You should be able to get Konica Direct to take care of it.

SOURCE: printer not receiving information from computer

I guess you mean the c350 is not printing while Windows said the job has been sent? If so, it may have changed IP Address from the time you first install the Printer on Windows. Check the Ports setting of the c350 printer! e.g.
Network Pritners should have Static IP address or at least a reserved DHCP IP Address. Logon to your Router, check the MAC Address of the c350 and reserve/assign it a IP Address near the end of the DHCP range. Save the Router configuration and power cycle the c350. Confirm IP Address changed to the reserved IP. 

Then you have to change all the PC's Printer Configuration of the c350's Port to update the reserved/assigned IP. Or remove the c350 from Printers and Faxes, then run the printer setup software again.

SOURCE: printer is offline

go to Start... click Run .... type services.msc and find print spooler right click stop and click start again

SOURCE: konica Minolta bizhub 250 jammed but no paper

Please check the sensors and actuators ,open & close front door to reset nisfeed.Clarification Top feed = Automatic Document Feeder?If YES,please verify misfeed paper beetween coverplaten and feedbelt(Yellow).Is necessary disassembly the ADF.Good luck.You will find a little paper.

Konica Minolta Error Codes and Solutions

• 210 Answers
• Posted on Aug 23, 2009

SOURCE: Konica Minolta PagePro 1350W Laser Printer won't print anymore

You have to be sure that you are connecting the printer in exact the same USB port. If you are connecting to a different port and not to the one from was disconnected, the Windows is installing another copy of your printer. Check this, I believe this is the solution to your problem.