1)uninstall driver software.
2)conect the machine to pc and turn it on.
3)find the machine is detected by pc.
4) if detected by pc ,install driver.
5)if it is not detected try another cable,another port.
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Hi,Check to see in the connectioncables are all plugged in correctly.Open the printer and see if drumunit and toner cartridges are installed correctly. Sometimes not well installedconsumables are the cause of that particular problem.See if the print driver on yourcomputer is correctly installed. Try and reinstall the driver.Check if your printer is working in onlinemode. Sometimes printer changes online to offline method. If printer is atoffline mode click Start button on your computer, enter Control Panel. Click onHardware and Sound and choose Printers. Right click on Brother MFC-9840CWD andmake sure that the Use Printer offline is not checked.Hope this helps.
I have a Brother MFC 7840W and have struggled with the wireless features. Not sure how you have this configured but if wireless suggest you find a way to connect via LAN or USB...I cannot make mine work via wireless but hardwired works fine. To fix, I had to 'reset' the MFC (functions on the MFC itself) and then reinstall the software selecting USB as the connection method. Sounds crazy but once I did it worked.