Device Manager

1.6 Given a scenario, configure Microsoft Windows settings

📘CompTIA A+ Core 2 (220-1202)

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What is Device Manager?

Device Manager is a built-in Windows system tool used to view, manage, troubleshoot, and configure hardware devices installed on a computer.

It allows technicians to:

• See all connected hardware devices
• Check device status and errors
• Install, update, roll back, or remove drivers
• Enable or disable hardware
• Troubleshoot hardware problems

Device Manager is critical for IT support and appears frequently in CompTIA A+ exam questions.

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How to Open Device Manager (Exam Knowledge)

You must know multiple ways to open Device Manager:

1. Right-click Start Menu → Device Manager
2. Run dialog
   • Press Windows + R
   • Type: devmgmt.msc
3. Control Panel → Device Manager
4. Search box → Type “Device Manager”

Exam Tip: devmgmt.msc is the direct command to open Device Manager.

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Device Manager Interface Overview

Device Manager displays hardware in categories, not as a flat list.

Common Device Categories

• Display adapters
• Network adapters
• Disk drives
• Keyboards
• Mice and other pointing devices
• Processors
• Sound, video and game controllers
• Universal Serial Bus (USB) controllers
• System devices
• Bluetooth
• Imaging devices

Each category can be expanded to show installed devices.

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Device Status Icons (VERY IMPORTANT FOR EXAM)

Device Manager uses symbols to indicate device problems.

Yellow Triangle with Exclamation Mark

• Device has a problem
• Usually driver-related or resource conflict

Red X (older Windows versions)

• Device is disabled

Down Arrow

• Device is manually disabled

No Icon

• Device is working normally

Exam Tip:
A yellow exclamation mark almost always means a driver issue.

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Viewing Device Properties

Right-click any device → Properties

The Properties window contains several important tabs.

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General Tab

Shows:

• Device name
• Device type
• Manufacturer
• Device status

Device Status Section

Displays error messages such as:

• “This device is working properly”
• “Windows cannot load the device driver”
• “This device is disabled”

Exam Focus:
Always check Device status first when troubleshooting.

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Driver Tab (EXTREMELY IMPORTANT FOR EXAM)

This is the most tested section in Device Manager.

Driver Tab Options

1. Driver Details

• Shows the driver files being used
• Useful for advanced troubleshooting

2. Update Driver

• Used to install a newer or correct driver
• Can search automatically or browse manually

3. Roll Back Driver

• Restores the previous driver version
• Used when a new driver causes problems

Exam Tip:
If a device stops working after a driver update → Roll Back Driver

4. Disable Device

• Turns off the device without uninstalling it
• Device remains installed but not active

5. Uninstall Device

• Removes the device and its driver
• Windows may reinstall it after reboot

Important Difference (Exam Favorite):

• Disable = device still installed
• Uninstall = device removed from system

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Details Tab

Shows advanced technical information:

• Hardware IDs
• Device instance paths
• Compatible IDs

Hardware IDs

• Used to identify exact hardware model
• Helpful when downloading drivers manually

Exam Tip:
Hardware IDs help identify unknown devices.

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Events Tab

Displays:

• Driver installation history
• Configuration changes
• Device start/stop events

Used mainly for troubleshooting.

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Power Management Tab

Common on devices like:

• Network adapters
• USB controllers

Options include:

• Allow the computer to turn off this device to save power
• Allow this device to wake the computer

Exam Scenario:
Network disconnects after sleep → Check Power Management settings.

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Enabling and Disabling Devices

Why Disable a Device?

• Troubleshooting conflicts
• Temporarily stopping faulty hardware
• Testing system behavior

Why Enable a Device?

• Device was disabled accidentally
• Required hardware needs to be reactivated

Right-click device → Enable or Disable

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Installing and Updating Drivers

When Drivers Are Needed

• New hardware installed
• Device shows yellow exclamation mark
• Device not functioning properly

Driver Sources (Exam Knowledge)

• Windows Update
• Manufacturer website
• Driver disk or package
• Manual driver installation

Best Practice:
Manufacturer drivers are usually more reliable than generic ones.

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Unknown Devices

If Device Manager shows Unknown device:

• Driver is missing
• Hardware is not recognized

How to Fix:

• Use Hardware ID
• Download correct driver
• Update driver manually

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Scan for Hardware Changes

Located under Action → Scan for hardware changes

Used when:

• New hardware is connected
• Device not showing automatically
• Driver reinstallation is needed

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Device Manager in Troubleshooting (Exam Scenarios)

Common Exam Scenarios

• Device not working → Check Device Manager
• Yellow exclamation mark → Update or reinstall driver
• Device stopped after update → Roll back driver
• USB device not detected → Scan for hardware changes
• Network adapter missing → Enable device or install driver

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Device Manager vs Other Tools (Quick Exam Reminder)

Tool	Purpose
Device Manager	Hardware & drivers
Disk Management	Storage & partitions
Task Manager	Processes & performance
Event Viewer	System logs
System Information	Hardware & system details

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Key Exam Points to Remember

• Device Manager manages hardware and drivers
• devmgmt.msc opens Device Manager
• Yellow triangle = device problem
• Roll back driver fixes post-update issues
• Disable ≠ Uninstall
• Hardware IDs identify unknown devices
• Scan for hardware changes detects new devices

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Summary

Device Manager is a core Windows configuration and troubleshooting tool tested heavily in CompTIA A+ Core 2 (220-1202).
Understanding device status icons, driver management, and troubleshooting steps is essential to passing the exam.