Do you have the full software installed or just the basic driver from Canon? What OS are you using?
http://www.usa.canon.com/cusa/support/consumer/printers_multifunction/pixma_mp_series/pixma_mp240#DriversAndSoftware has the software and drivers. If you installed the OS driver, you should uninstall that, disconnect the data cable and then install the driver from Canon. The generic OS driver usually only runs the printer.
Place the document face down on the scanner glass or face up if you have an ADF. Check that the all-in-one and the computer have good bi-directional communication. (Direct USB connection (if you are using that), replace cables if the printer works but not the scanner and the Canon software is installed.)
If you are using the Canon software, you need to set up the destinations for the buttons and have the monitoring software running. Thus start scanning from the computer at first. Launch MP Navigator and then click on the type of document you want to scan. Find the resolution and contrast that works for you. Use these in setting the button defaults (see the manual from Canon). Then click Scan.
Alternately, with Windows XP, Vista and Win7, you can scan with software that came with the OS. Paint is available on all of these OS versions (File > Import from camera scanner > from scanner). Vista includes PhotoGallery which works like Paint (this can be downloaded for XP and Win7). Vista and Win7 also can scan with Windows Fax and Scan (New Scan).
When you have the MP Navigator properly set up, you will be able to launch a scan from the printer. Press the Scan button and the software will launch.
I hope this helps.
Cindy Wells
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