Here are a few things to check:

1. Ensure you have compatible versions of the software installed using our installer. The minimum version of Logger Pro needed is
   • Original LabQuest: Logger Pro 3.6
   • LabQuest 2: Logger Pro 3.8.5
   • LabQuest 3: Logger Pro 3.16.1

     The terminal version of Logger Pro is 3.16.2, so in most cases you should be running this version.

If you have an older version of the software, the updater is a free download from our website at
https://www.vernier.com/downloads/logger-pro-updates/

2. If you are using LabQuest 2 or LabQuest 3, make sure it is not set to “Viewer over USB” mode. When this is on, LabQuest can connect to the LabQuest Viewer^® (LQ-VIEW) software, but not Logger Pro. On LabQuest:
   1. Launch the Connections App
      • LabQuest 2: tap the Wi-Fi icon
      • LabQuest 3: tap the Settings icon, then tap Connections App.
   2. Tap the Viewer icon.
   3. Make sure “Enable Viewer over USB” is unchecked. If checked, uncheck it.
   4. Tap Close to commit the change.

3. Reboot your LabQuest and try reconnecting it to Logger Pro.
   • Original LabQuest: Tap Home, choose Control Panel, then tap Reboot.
   • LabQuest 2: Tap Home, choose System, and then Reboot.
   • LabQuest: Tap Settings and then Reboot.

4. Keep in mind a few standard USB troubleshooting steps:
   • Try connecting to a different LabQuest or a different computer.
   • Try a different USB port on the same computer.
   • Use a different USB cable.
   • On Windows, determine if you are getting feedback on the Taskbar that a USB device (LabQuest) is being connected when you connect the USB. If there’s no bubble in the lower right part of the screen when connecting to a USB port, it is likely that the LabQuest drivers are not installed, or are being blocked by your school’s IT policies. Log in as the user named “administrator”, reinstall Logger Pro, and then connect LabQuest. Watch for connection alerts.

See also:
Are the LabQuest 2 or LabQuest 3 device drivers installed correctly?
Are the device drivers installed correctly? (For Windows with LabPro, original LabQuests, LabQuest Mini, and LabQuest Stream)
Windows Pre-Logger Pro 3.11 original LabQuest and LabQuest Mini, and pre-3.12 LabPro drivers
LabQuest with lots of data won't connect to a computer.
My original LabQuest does not connect to computer or see a USB thumb drive.