> ## Documentation Index
> Fetch the complete documentation index at: https://docs.goguardian.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshoot Teacher Commands

> Steps to resolve issues with GoGuardian Teacher commands like locking screens or opening and closing tabs.

When GoGuardian Teacher commands like locking or unlocking a student's screen or opening and closing tabs aren't working as expected, try the following steps.

1. Have the student restart their Chromebook, then attempt the command again.

2. End the current class session and start a new one.

3. On your device, clear the cache by pressing **Command-Shift-R** (Mac) or **Control-Shift-R** (PC).

4. Check that the time on your device is set correctly by comparing it to [https://time.is](https://time.is). Adjust the time if it doesn't match, then retry the command.

## Resources

<CardGroup cols={2}>
  <Card title="Commands Overview" href="/products/teacher/commands-overview">
    Learn about the commands available in GoGuardian Teacher.
  </Card>

  <Card title="Lock Student Screen" href="/products/teacher/lock-screen">
    Instructions for locking and unlocking student screens during a session.
  </Card>

  <Card title="Start a Classroom Session" href="/products/teacher/start-a-classroom-session">
    How to start and manage a GoGuardian Teacher classroom session.
  </Card>

  <Card title="FAQs" href="/products/teacher/faqs">
    Answers to common questions about GoGuardian Teacher.
  </Card>
</CardGroup>