What happens if you plug the printer in the second USB port and also when it is plugged in the front of the computer? Is it possible the mouse DIN connector has an oversized plastic housing causing both to be off off alignment slightly? Can you borrow another USB cable to see if yours has failed? Can you try the printer in another computer to ensure it is working correctly? Click Start/Control panel/System/Hardware/Device manager and scroll to the bottom for the USB jacks. Click the plus sign beside the USB connectors to drop the menu down and see if they are all working correctly. Do that by right clicking on each one and clicking Properties

Ha, no other takers. Try the following. First, I'll assume the two PCs have distinct names and are connected to a router (any combination of WIFI, ethernet or both). Also I assume both have the needed drivers installed for the printer. Pick one PC to be "home base". Connect the printer to it and then install the printer as a network printer as follows: Control Panel Printers and Faxes Add a Printer (Printer Wizard Starts) Next Choose "A network printer or a printer attached to another computer" - Then Next Choose - Browse for a Printer - Then Next You'll See the printer, highlight it. Next Choose yes to "Do you want this as default printer" Done. STOP HERE Before leaving this PC, go back to the Printers and Faxes page under COntrol Panel, Highlight the printer you just added, click on Share This Printer, then give it a name and then OK. Go to the Second PC, repeat all the same steps. When doing Browse for a Printer, you'll see the printer on the other PC, choose that and continue until you reach STOP HERE. You should now have a networked printer. If I goofed something up or it doesn't work, I'm sure you'll let me know. Good luck.

File and printer sharing: frequently asked questions there are links there to printer sharing in windows 7 and also a video. Use the Homegroup Feature in Windows 7 to Share Printers and Files more info since both have windows 7 it should be fairly straight forward, when sharing between xp and 7 it gets a little more complicated. Be absolutely sure you use the exact name for your group names on each pc.

Are there any Cleaning Features you can use. Sometimes this will help when a printer has sat for a while. On my Brother Inkjet (MFC-845cw) I have to clean it numerous times to get it to print correctly. It doesn't get used much (only for Photos on Photo Paper). We have Two Brother Color Laser AIO Printers (MFC-9440cn and DCp9040cn) that are the really workhorses in our printing. Your Printer has a LED Readout and in the Menu you might find the Cleaning Feature. Scroll thru and see if you can find it. Once you find this feature run it several times to see if it helps. I would run it 10-15 times to be sure it's printing correctly!