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

# IT Troubleshooting Knowledge Base: All Topic Guides

> Browse step-by-step troubleshooting guides for networking, Windows, macOS, Linux, hardware, security, and cloud and SaaS issues in IT environments.

Welcome to the IT Troubleshooting Knowledge Base — your go-to resource for diagnosing and resolving common IT problems. Whether you're dealing with a network outage, a blue screen, a security incident, or a cloud app issue, you'll find clear, step-by-step guides to get you back on track quickly.

<CardGroup cols={2}>
  <Card title="Networking" icon="network-wired" href="/networking/no-internet-connection">
    Resolve connectivity issues, DNS problems, VPN failures, and slow network performance.
  </Card>

  <Card title="Windows" icon="windows" href="/windows/boot-issues">
    Fix boot failures, blue screens, update errors, driver problems, and performance issues.
  </Card>

  <Card title="macOS & Linux" icon="apple" href="/unix/macos-startup-issues">
    Troubleshoot startup failures, permission errors, disk space, and boot repair on Unix systems.
  </Card>

  <Card title="Hardware" icon="microchip" href="/hardware/no-display">
    Diagnose display failures, overheating, storage failures, and unrecognized peripherals.
  </Card>

  <Card title="Email & Collaboration" icon="envelope" href="/email/outlook-issues">
    Fix Outlook, Teams, email delivery, and calendar sync problems.
  </Card>

  <Card title="Security" icon="shield-halved" href="/security/malware-removal">
    Respond to malware, account lockouts, MFA issues, and phishing incidents.
  </Card>

  <Card title="Cloud & SaaS" icon="cloud" href="/cloud/microsoft-365-issues">
    Resolve Microsoft 365, Google Workspace, OneDrive, and Azure AD sign-in issues.
  </Card>

  <Card title="Quick Reference" icon="book-open" href="/reference/common-error-codes">
    Error codes, diagnostic commands, common ports, and IT glossary.
  </Card>
</CardGroup>

## How to Use This Knowledge Base

Each guide is structured to help you resolve issues systematically — from quick checks to advanced diagnostics. Start with the symptoms you're seeing and follow the steps in order.

<Steps>
  <Step title="Identify Your Issue">
    Browse the categories above or use the search bar to find guides matching your symptoms or error message.
  </Step>

  <Step title="Follow the Steps">
    Each guide walks you through a series of diagnostic checks and fixes in order of complexity — start from the top.
  </Step>

  <Step title="Check the Reference">
    If you encounter an unfamiliar error code or need a quick command, visit the [Quick Reference](/reference/common-error-codes) section.
  </Step>

  <Step title="Escalate If Needed">
    Guides include escalation advice when an issue requires specialist intervention or hardware replacement.
  </Step>
</Steps>

<Tip>
  Use the search bar at the top to find guides by error message, symptom, or product name — it's the fastest way to locate the right article.
</Tip>