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5.1 Make the system boring first

Lesson
Hardware safety: isolate power; never open a PSU.

Before touching hardware

  • Follow the exact model's service instructions. Shut down, unplug mains and peripherals, and disconnect any internal battery as instructed. Sleep, the PSU switch, or unplugging a laptop charger alone does not fully isolate power.
  • Let parts cool. Use a clean, dry workspace and approved ESD precautions. Hold boards by their edges, avoid contacts, account for screws, and never force connectors.
  • Never open a PSU or insert tools through its vents; stored energy can remain after unplugging. Use only modular cables confirmed compatible with the exact PSU model.
  • Isolate power before every physical change or cleaning. Powered tests are software/external observations with hands and tools out. No live probing, unspecified pin bridging, or damaged-battery servicing.
  • Stop for damage, swelling, liquid, burning smells, or unclear instructions; consult qualified service. Photos, diagrams, and supplied readings are sufficient for these exercises.

Service and ESD guidance · Example PSU cable chart. Check your exact model.

Practice lab

0 / 1solved

Saved on this device. Practice is ungraded.

Investigate

Prepare a RAM warranty case

A repair technician is investigating a customer’s repeated crashes with a supported RAM kit. Under the same diagnostic at default settings, module A fails in A2 and B2 while module B passes in both. Identify the leading suspect and the confirmation evidence needed for vendor support. The matrix narrows the fault without excluding every electrical cause.

Decision 1

Read the crossed test results

Which component is the leading suspect?

Lesson notes

RAM instability can cause restarts, failed boots, crashes, or errors. Establish a repeatable supported baseline.

Baseline first

Turn off tuning profiles, use recommended slots, test one kit at a time, and run memory diagnostics long enough to catch problems.

  • Default settings are a useful starting point.
  • One change at a time makes results clearer.
  • A repeatable error is easier to fix than a random feeling.

Use clues from slot and module testing

If one module fails in multiple slots, the module may be suspect. If several modules fail in one slot, the board or CPU memory path may need attention.

Worked example

Inputs: Default settings: module A fails in two supported slots; B passes in both. Same test configuration.

Task: Rank the suspect and a safe next action.

Check the reasoning

A is the leading suspect. Confirm compatibility/vendor diagnostics and seek support rather than raising voltage.

A failed test narrows the issue, not every electrical cause. Isolate power before each swap.