Intermediate level · Module 2: Hardware Diagnostics and Repair · Lesson 1 of 3
Hardware Diagnostic Tools
Use tools and signals to find faulty hardware.
In this lesson you will
- Interpret POST signals
- Run memory, drive and manufacturer diagnostics
Key concepts
POSTbeep and light codesmemory diagnosticsdrive health
The lesson
At start-up the computer runs a power-on self-test (POST). Beep or light patterns indicate faults; their meaning is in the manufacturer's documentation.
Windows Memory Diagnostic tests RAM; drive health tools read SMART data; many manufacturers provide built-in diagnostics at start-up.
Swap in known-good parts to confirm a diagnosis before buying replacements.
Step by step
- Look up a beep code.
- Run a memory test.
- Read drive health data.
- Confirm with a known-good part.
Practice activity
Diagnose two hardware faults with tools and part swaps.
Expected result: Faults confirmed with evidence before replacement.
Check your understanding
-
What does POST do?
Show answer
Tests hardware at start-up.
-
Why test with a known-good part?
Show answer
To confirm the diagnosis before buying parts.
Taught live by an instructor — online or in person. Free course lessons are for self-study and do not lead to a certificate — see registration options.