4.2 Given a scenario, troubleshoot common hardware failures.
📘CompTIA Server+ (SK0-005)
This section explains the main tools and techniques used to identify and fix hardware problems in servers. For the CompTIA Server+ (SK0-005) exam, you must understand what each tool does, when to use it, and why it is important.
1. Event Logs
What are Event Logs?
Event logs are records of system activity stored by the operating system and applications. They help administrators understand what happened before, during, and after a failure.
Types of Event Logs
- System logs → Hardware and driver-related events
- Application logs → Software-related events
- Security logs → Login attempts and access control
How Event Logs Help in Troubleshooting
- Show errors, warnings, and critical failures
- Help identify hardware-related issues such as:
- Disk failures
- Memory errors
- Driver problems
- Provide timestamps to track when the issue occurred
Common Log Indicators
- Error → A serious problem (e.g., device failure)
- Warning → A possible future issue
- Information → Normal system activity
Exam Tips
- Always check logs first when troubleshooting
- Look for repeated errors
- Focus on logs just before the failure
2. Firmware Upgrades or Downgrades
What is Firmware?
Firmware is low-level software that controls hardware devices.
Examples:
- BIOS/UEFI
- RAID controller firmware
- Network card firmware
Why Firmware Matters
- Controls how hardware communicates with the system
- Can cause issues if:
- Outdated
- Corrupted
- Incompatible with other components
Upgrade (Update) Firmware
Used when:
- Fixing bugs or known issues
- Improving performance
- Adding compatibility with new hardware
Downgrade Firmware
Used when:
- A new update causes instability
- Hardware becomes incompatible after an update
Important Best Practices
- Always backup configuration before updating
- Follow vendor instructions carefully
- Avoid power interruption during updates
Exam Tips
- Firmware issues are a common cause of hardware failure
- Know when to upgrade vs downgrade
3. Hardware Diagnostics
What are Hardware Diagnostics?
These are tools and tests used to check if hardware components are working properly.
Types of Diagnostic Tools
- Built-in diagnostics
- BIOS/UEFI tests
- POST (Power-On Self-Test)
- Vendor tools
- Server manufacturer diagnostic utilities
- Third-party tools
- Memory testers
- Disk health tools
What Can Be Tested
- CPU health
- RAM (memory errors)
- Storage devices (bad sectors, failures)
- Power supply
- Fans and temperature sensors
When to Use Diagnostics
- System crashes frequently
- Server does not boot
- Performance issues
- Suspected hardware failure
Exam Tips
- Diagnostics help confirm hardware failure
- Use them before replacing components
4. Compressed Air
What is Compressed Air Used For?
Compressed air is used to clean dust and debris from hardware components.
Why Cleaning is Important
Dust can cause:
- Overheating
- Fan failure
- Poor airflow
- Short circuits (in extreme cases)
Where to Use It
- Fans
- Power supply vents
- Heat sinks
- Server chassis
Best Practices
- Turn off and unplug equipment
- Use short bursts of air
- Hold fans in place while cleaning (to prevent damage)
- Avoid moisture
Exam Tips
- Dust = environmental cause of hardware failure
- Cleaning is a preventive maintenance technique
5. Electrostatic Discharge (ESD) Equipment
What is ESD?
Electrostatic discharge is static electricity that can damage sensitive electronic components.
Why ESD is Dangerous
- Can destroy components instantly
- Damage may not be visible
- Can cause intermittent failures
Common ESD Protection Equipment
- ESD wrist strap
- Grounds the technician
- ESD mat
- Safe surface for hardware work
- Anti-static bags
- Store and transport components safely
Best Practices
- Always ground yourself before touching components
- Work in an ESD-safe environment
- Store parts in anti-static packaging
Exam Tips
- ESD protection is critical when handling hardware
- Lack of ESD precautions can cause hidden failures
6. Reseating or Replacing Components and/or Cables
What Does “Reseating” Mean?
Reseating means removing and reinstalling a component to ensure proper connection.
Why Reseating is Needed
Loose or improper connections can cause:
- System not booting
- Intermittent failures
- Hardware not detected
Components That May Need Reseating
- RAM modules
- Expansion cards (NIC, GPU, RAID cards)
- Power cables
- Data cables (SATA, SAS)
Replacing Components
If reseating does not fix the issue:
- Replace the faulty hardware
- Replace damaged or worn cables
Signs You Need Replacement
- Physical damage
- Burn marks
- Repeated failures
- Diagnostic test failures
Exam Tips
- Always try reseating before replacing
- Check cables first (simple and common issue)
Summary (Exam Quick Review)
| Tool/Technique | Purpose |
|---|---|
| Event Logs | Identify errors and failure history |
| Firmware Upgrade/Downgrade | Fix compatibility and bugs |
| Hardware Diagnostics | Test and confirm hardware issues |
| Compressed Air | Prevent overheating and dust issues |
| ESD Equipment | Protect components from static damage |
| Reseating/Replacing | Fix loose or faulty connections |
Key Exam Points to Remember
- Always start with logs and diagnostics
- Use firmware updates carefully
- Clean hardware regularly
- Prevent damage using ESD protection
- Try reseating before replacing hardware
- Check simple issues first (like cables)
