Start simple:

  • Power strip or outlet fault; try a different known-good outlet.
  • For desktops, check PSU switch, 24-pin and CPU 8-pin connections.
  • For laptops, test with battery removed (if possible) and adapter only.
  • Look for liquid damage or burnt smells near DC jack/VRMs.
  • Motherboard short from standoff or debris.

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What it might be (likely causes)

  • No AC or a tripped power path
    Dead outlet, tripped power strip, or a PSU rocker switch in the O position. On laptops, a failed charger or loose DC jack can present as “totally dead.”