These suggestions may help you resolve issues when swiping cards.
Test the card reader connection
Double-check that the card reader is firmly connected to your computer via the USB port. Be sure the reader is ready before you swipe the card. When the light on the card reader is green, it's ready to accept a card.
Ensure you are using a compatible card reader
Only devices purchased from Intuit are fully supported. Ensure that your card reader is a MagTek USB device.
Use a direct USB connection
Plug the reader directly into one of your computer's USB ports, not through a keyboard or a USB hub. Switch ports and restart the computer, if needed.
Swipe the card correctly
Face the card's magnetic stripe towards the light. Swipe the card once from either end.
Check the card's magnetic stripe
If the card can't be read, its magnetic stripe may be damaged. Check the stripe for any residue and wipe it off.
Check the card reader
If the light is red, it means the reader didn't read the card correctly. If this happens a lot, the magnetic head may need cleaning. You can purchase cleaning cards at office supply stores. If the card reader beeps or blinks, or if card data seems incomplete or garbled onscreen, the card reader may be damaged or improperly configured. Contact the manufacturer.
Try a different card or computer
Try different types of cards to see if the card itself or the card type is causing the issue. You can also try using the card reader and swiping the card on another computer. A computer's security setting could be blocking the reader from working properly.
Switch from HID to keyboard mode
If the card reader is unresponsive, try switching from HID (human interface device) to keyboard emulation mode. For MagTek readers, go to MagTek website to toggle easily between the two modes with your reader plugged in. If you have a different card reader, search the manufacturer site for information about switching modes.
If a card can't be swiped
If you still can't swipe a card after following the troubleshooting recommendations, enter the card information manually so you don't lose the sale or payment. The rate for the keyed transaction will be higher.