HP C4180 prints fine, will not scan to imac, get error message, does not recognize computer

Try resetting the printer:
Reset the printer
-Disconnect the Universal Serial Bus (USB) cable from the back of the printer, but leave the printer turned on.
-Open the cover of the printer and remove the print cartridges.
-Close the cover and wait for the Insert Ink Cartridges message.
-Disconnect the power cord from the back of the printer and wait for one minute.
-Reconnect the power cord. If the printer does not automatically turn on, press the Power button.
-Open the cover and reinsert the print cartridges.
-Close the cover. If prompted, print a calibration page.
-Reconnect the USB cable, and try to print a print job from the computer.
Hope that helps!

This means that your system does not display any printer name under the printer's list even though you would have installed your wireless printer on your Windows Vista system. This could be caused if you have not updated printer drivers in your system or the printer is incompatible with Windows Vista. Also see if the Windows firewall is blocking the printer from being recognized by your system. get more information for HP Wireless Printer Problems . Hope this helps you.

Try Using the HP Print Diagnostic Utility in Windows - HP Customer Care (United States - English)

and

Using the HP Scan Diagnostic Utility in Windows - HP Customer Care (United States - English) in that order.

Give this a try.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00662181&tmp_task=solveCategory&lc=en&dlc=en&cc=us&lang=en&product=1141647

follow info guide manual it shud show u step by step

Install all the software on the installation cd.

open the solution centre s/w and then populate the destination folder list and the scan to list in the scan settings window.
see if it works...

You need to set up the software on the iMac. The reason it gives you that error message is because it can't communicate with the computer and imaging software as the computer doesn't see the scanner and can't communicate with the printer's control interface. The iMac may see the printer and be able to print without any additional software because the driver package for the printer portion may already be installed with the OS X HP printer driver support. You didn't mention whether or not you could print from OS X. I am assuming you can. Faxing and copying from the unit doesn't use the computer at all and doesn't need to communicate with it. Scanning and printing do. If you can't print either then none of the driver or support software is installed and you have to set it up. You can get the instructions for setting the printer up in OS X 10.5 from HP. Just click here and it will take you to the page with the instructions.

Best wishes and cheers

Hi,

Could you please let us know the error message and the exact status of the printer icon and try to check out the ports which might have been corrupted.


Regards,

Sagarjd

Can you provide a bit more information. What problems are you having? Are you getting error messages? Where are you trying to download from?