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 for the original LabQuest is 3.6 or newer, for the LabQuest 2 you need 3.8.5 or newer. For Logger Lite with the original LabQuest you need to be running version 1.4 or newer, for the the LabQuest 2 you need version 1.6 or newer. If you have an older version of the software, the updater is a free download from our website at:

2. If you are using LabQuest 2, 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:
a. Tap the Wi-Fi icon on the LabQuest 2 toolbar.
b. Tap the Viewer gear icon.
c. Make sure “Enable Viewer over USB” is unchecked.

3. Reboot your LabQuest and try reconnecting it to Logger Pro. See How do I reboot or reset a LabQuest?.

4. If you are using the Original LabQuest, make sure the internal Temperature Probe is not active. When it is active (displayed on meter screen), LabQuest will not connect to Logger Pro. This is a known problem in versions 1.0 and 1.1 of the LabQuest App. This problem has been fixed in LabQuest App version 1.2 and newer, which is a free download at:

5. Keep in mind a few standard USB troubleshooting steps:
     a. Try connecting to a different LabQuest or a different computer.
     b. Try a different USB port on the same computer.
     c. 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.

Note: Windows 2000 has connection problems with original LabQuest and is not supported. There is no known workaround for using LabQuest with Windows 2000.

See also:
Are the LabQuest 2 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.
LabQuest does not connect to computer or see a USB thumb drive.