I'm sorry about the issue. What's the error or message?
Are you still able to make a copy from the printer's glass (not print from the laptop)?
Is the printer connected to the laptop with a USB cable? Or is the connection wireless?
Do you have windows xp, vista, or 7, or 8, 10?
Please reply at the box below. Thank you.
What's the error or message when printing?
Was there any change recently to your computer or internet / wireless modem/router device that may have caused this issue?
Can you click on Start, then click on Devices and Printers, then do you see your Canon MF4800 printer there? Then there, can you click on the option Add a printer at the top, then click on the network / wireless... option, then does it see your printer with an IP address number (such as 192.168.1.25), (the cancel / close that window)?