It starts to print and then stops responding. Connected to printer. It scans fine but will not print from the computer

Many machines allow network printing but not network scanning. I think you will find that the MX850 driver and MP Navigator software simply does not support network scanning. I suggest you query Canon directly.

Test your printer on an ordinary document. If it prints OK it's not your printer or document.

If you printer hasn't a built-in wireless connection and if you haven't a wireless router then -
You need a wireless router plus print server. Connect this print server to the wireless router with a LAN cable. Then the printer is then connected to the print server's printer port.
The laptop's wireless card is then configured with the router's wireless settings.
The laptop is then installed with the printer driver and the printer port needs to be changed/configured with the print server's IP address.
ALTERNATELY
If the printer is connected to a desktop computer on your home LAN and it is also connected to your wireless router. Then you can set this printer as A Shared Printer on your desktop computer, but this desktop computer and the printer has to be powered up for the laptop to print to the printer.
For instruction on setting up a shares network printer, please click on this link and follow my instructions :-
http://www.fixya.com/support/r3668797-setting_up_shared_network_printer

Hi Daniel, I just had a quick look and other people here have posted problems regarding error code 300 on the MX850. Take a look here when you get a minute to see if any of the solutions posted help you out at all. It's a long shot as this link is for Apple users but it might point you in a direction you hadn't yet tried. All the best.

You will probably have to go to this page to download the new Mac drivers for Snow Leopard to get the full functionality of your All-in-one printer back.

Print functions are generic enough where you don't need to have the most updated driver for it to work. But the scanning functionalities are more complicated.

Find the driver for your computer here:

HP drivers download for PhotoSmart C4480

Is it connected by a USB cable? Try a new data cable and swapping ports. If you have it connected to a print server or USB hub, try a direct connection. Scanners require bi-directional communication with the computer and are more likely to fail to respond to a problem that blocks the signal than the printer. Does the scanner light move and make the usual warm up sounds? Do you have the full software installed or a basic driver from the OS? Do you have the latest software installed?

Disconnect the power cord from both the unit and the wall outlet and the USB cable from both the computer and the printer. Wait at least 10 seconds before reconnecting (resets the all-in-one). Repeat the USB cable removal with the computer and the printer on. Reboot the computer (in case something is locking the scanner in memory).

Check if the scanner shows up as an imaging device. Click My Computer (in some versions of windows), Properties. Click the Device Manager tab. Open Imaging Device. Highlight the all-in-one and click Remove. Try scanning again. (This can be found through the control panel on other versions of Windows.)

I hope this helps.

Cindy Wells

I hope this helps.

Hi! I will be glad to assist you in this issue, here is the link that will help you to fix the issue,

While Scanning, the HP All-in-One or Software Does not Respond or Windows Stops Responding

http://h10025.www1.hp.com/ewfrf/wc/document?docname=bpu04824&tmp_task=solveCategory&lc=en&dlc=en&cc=us&product=60630&lang=en

Computer Stops Responding When Using the Scan To Feature

http://h10025.www1.hp.com/ewfrf/wc/document?docname=bpu03112&tmp_task=solveCategory&lc=en&dlc=en&cc=us&product=60630&lang=en

How to Scan in Windows XP without Using HP Software

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01843437&tmp_task=useCategory&lc=en&dlc=en&cc=us&lang=en&product=60630

I had this same problem and it is fixable, but not the way you would probably like, though you can still scan with the printer. You just have to open the Paint program and click from scanner or camera, and then choose your printer and click scan preview, and then scan, it works just fine but its a little time consuming.

To get over this problem, First uninstall your printer and reboot your computer and again install the driver of printer and if the problem persist then consult Epson Printer Support team and get connected with the expert technicians of the customer service by just dialing 1-800-243-0019(toll free) and get your issue resolved in a short span of time.

I have had the same problem. 2 computers had been able to print fine then 1 stopped (other was still fine). I use Network Magic as well- noticed that the IP address for the print server was different on each computer.
I deleted the 2 printers on the computer that could not communicate to the server, logged into the server and set its IP address to static at the address listed on the computer that could print. Next ran the set up for the printers on the problem computer again.
Test pages now printed out fine.