No power is smaller than no boot
A machine with no fans, no lights, and no standby signs should stay on the power path before it gets mixed with boot or display problems.
Why your PC has no power
This page is for the moment when the PC shows no real signs of life and it is not yet clear whether the problem is wall power, the power path inside the system, or a symptom that only looks like true no-power. The goal is to confirm the smallest safe checks first so the repair path stays calm.
External power still matters
Outlet changes, surge devices, cable seating, and the PSU switch can explain more than people expect.
Do not swap parts before the basics are clear
Confirming the power path first is usually more useful than reseating everything at once.
Keep the first checks small
- Confirm the outlet, surge protector, UPS, and power cable with one known-good path.
- Check the PSU switch and the power cable seating at both ends before opening the case.
- Notice whether any standby light, motherboard light, or brief fan twitch appears.
- Think about the last real change: transport, cleaning, cable moves, PSU swaps, or front-panel work.
Open the next page that matches what the system does next
If the machine starts showing lights or fans, move into no-display or no-POST instead of staying on the no-power branch.
If the symptom stays active
Use the right live repair branch
Recommended next tools
Use the gear pages only after the power path points there
This page should still lead with wall power, switches, cables, and basic evidence before replacement or rebuild decisions. When the issue points back to setup gear or power protection, use the reusable bundle pages so those recommendations stay in one place.