Desktop PC does not respond to the power button
Separate no response from power without a picture. Check external power and recent changes before blaming a component.
Try this first
1 quick checks · ~5 min
Find your situation
See all the clues. Choose the one that matches what you observe.
No lights, fans, or other reaction
Check the external power path first.
A standby light exists, but startup does not happen
Some power is present; this does not certify the PSU or motherboard.
It responds briefly, then switches off
This is no longer no response: switch to immediate-shutdown diagnosis.
Lights or fans stay active without a picture
Use the powers-on-without-display path.
It began after work inside the computer
The work performed provides a concrete lead for service or the model manual.
Diagnostic signals
- ObservationA standby light does not demonstrate normal startup
- It indicates power in part of the circuit. It does not prove that every PSU output or the motherboard works.
- ObservationChecked outlet and compatible cable, still no response
- The external path becomes less likely; PSU, button, and board need diagnosis rather than replacement by elimination.
Step-by-step solutions
Classify the reaction already observed
Avoid repeated power attempts to confirm a dangerous sign.
Record whether there was no response, a standby light, or spinning fans. Do not open an energized computer to look for a light. If there is a code or beep pattern, retain it and consult the exact manual: meanings are not universal.
If it stays on without a picture, continue with ISS-0001; if it starts and immediately stops, use ISS-0014. Continue with external power only when startup activity is absent.
Check one external power variable at a time
An off power strip and a failed PSU can produce the same lack of response.
With no damage signs, check the outlet using a known safe device and confirm the power strip is on. Check the PSU rear switch if present, following its markings. Do not change a voltage selector or handle damaged plugs.
With the computer disconnected, check that the external cable is properly seated. If another compatible undamaged cable is available, compare only that cable. Recovery implicates the changed path; no change does not justify buying a PSU on this result alone.
Interpret standby power without bridging contacts
Having some power is not the same as being able to start.
Record the label and pattern of the already visible light; use the OEM manual for a prebuilt system. If it remains on but the button starts no activity, report that difference from complete absence of lights.
Do not perform a paperclip PSU test or short power-button pins. The next step is model-appropriate PSU, button, and board testing by support or a qualified technician.
Relate the failure to recent work
Timing narrows what to inspect; it does not identify a failed component.
Record what was installed, removed, or disconnected and whether the PC worked immediately beforehand. For a prebuilt, tell the manufacturer; for a custom build, tell the person who performed the work, with board and PSU models.
A missed connection warrants targeted inspection with power disconnected and the correct manual. If you cannot identify it safely, do not remove more parts or mix modular cables from different PSUs: request inspection.
Still not working?
If the outlet and compatible cable are checked and there is still no reaction, stop at OEM service or hardware diagnosis. Provide light patterns, recent changes, and external tests. Do not open the PSU or declare the board dead by elimination.
Sources
Documentation behind this guide. Editorial recommendations are identified separately.
Source review: . A documentation review, not a physical hardware test.
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