Hardware and Troubleshooting
Domain 7: Hardware and Troubleshooting
This domain tests identification of PC components and a safe, logical approach to faults. Questions often present a symptom-no display, no power, slow performance, printer failure-and ask for the likely cause or first step. Safety and data protection matter as much as the fix.
Core rules and concepts
- Main components: motherboard, CPU with heatsink, RAM modules, storage (HDD/SSD), SMPS/power supply, expansion cards, ports, and peripherals.
- Use a structured flow: confirm the complaint, back up data where possible, check power and cabling, observe error beeps/POST messages, isolate by swapping known-good parts, test, and document.
- Safety: power off and unplug before opening the case; use ESD protection; do not open a power supply (stored charge); avoid touching gold contacts; handle boards by edges.
- Common faults: no display often RAM seating or monitor cable; continuous beeps may indicate RAM; no power may be SMPS, cable, or switch; slow PC may be low RAM, full disk, malware, or too many startup programs; printer issues often paper, cartridge, driver, or queue.
- Drivers let the OS communicate with hardware. Install them from reliable sources and keep backups.
Worked example
Question: A desktop powers on, fans spin, but the monitor shows “No signal.” What is the best first check? Reasoning: Since fans spin, power is likely present. First check the monitor cable and input source, then reseat RAM and listen for beeps. This isolates display connection before replacing parts. Replacing the motherboard first is wasteful and may introduce new faults.
Traps that cost marks
Do not suggest opening the SMPS. Do not skip backup before repairs. Do not confuse a hardware fault with a driver/software fault. Do not reseat components with power on. Do not assume a black screen always means a dead monitor.