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Hardware and Network Troubleshooting

Troubleshooting

  • Change control - Formal process for managing change to avoid confusion; requires plan, risk estimation, recovery plan and documentation.

  • Troubleshooting process:

    1. Identify the problem
    2. Establish a theory
    3. Test the theory
    4. Create plan of action
    5. Implement the solution
    6. Verify full system functionality
    7. Document findings

Troubleshooting Computer Hardware

  • Unexpected shutdowns - heat-related issues; failing hardware.

  • Lockups - check for activity; update drivers and software patches; low resources.

  • Continuous reboots - bad driver or configuration; use Safe Mode; bad hardware.

  • No power - check power supply; check fan power connection.

  • Overheating - check cooling system.

  • Loud noises - loose components; hard drive issues; fan problems.

  • Intermittent device failure - bad install; bad hardware.

  • Smoke and burning smell - electrical issues; disconnect power; bad components.

  • Crash screens (BSOD) - document information to track problems.

Troubleshooting Storage

  • Disk failure symptoms - read/write failure; slow performance; loud clicking noise

  • Troubleshooting disk failures - backup; check loose components, overheating.

  • Boot failure symptoms - drive not recognised; OS not found.

  • Troubleshooting boot failures - check cables; check boot sequence in BIOS.

Troubleshooting Displays

  • No video image - check connections; input selection on monitor; brightness controls; use VGA mode.

  • Image quality problems - check cable pins; check native resolution; disable hardware acceleration.

  • Artifacts (unusual graphics) - check adapter; turn off display.

Troubleshooting Mobile Devices

  • LCD display troubleshooting - check backlight; check with external display; connector issues.

  • Input issues - sticking keys; pointer drift; update drivers.

  • Power issues - replace battery; master laptop reset.

  • Touchscreen non-responsive - reset mobile; remove and put back battery.

  • App issues - stop app and restart; restart phone; update app.

  • Short battery life - bad reception; disable unnecessary features; check battery usage; replace battery.

  • Overheating - check app usage; avoid direct sunlight.

  • Frozen systems - soft reset; hard reset; factory reset.

  • No sound from speakers - check volume settings; re-install app.

  • Swollen battery - buildup of gas; faulty battery; dispose immediately.

Troubleshooting Printers

  • Bad output - clean print-heads; check drum; low toner/ink; clean properly.

  • Wrong color - replace/clean cartridge.

  • Smudging issues - toner not fused properly.

  • Paper jam - remove paper carefully; check tray, pickup rollers.

  • Failed jobs - corrupted print jobs; check event logs.

Troubleshooting Networks

  • No network connectivity - ping loopback; ping local IP address; ping default gateway.

  • Intermittent connectivity - check system tray; cable problems; bad interfaces.

  • Slow transfer speeds - router issues; hardware issues with adapter; malware infection.