LabQuest does not connect to computer or see a USB thumb drive.

This information pertains to the original LabQuest.
If you have LabQuest 2, see LabQuest 2 FAQs and Troubleshooting

If a LabQuest is not recognized by a computer that can see a different LabQuest, or if the unit fails to recognize a USB thumb drive, the circuit board in the LabQuest that controls both USB ports may be broken.

In this case, please contact Vernier technical support for a repair authorization.

See also:
TIL 1782: My USB drive is not recognized by LabQuest. What can I do?