You press the power button and get absolutely nothing — no LED, no fan twitch, no sound. It feels like a dead SMPS. Very often it is a dead ten-rupee link somewhere before the SMPS. Check the whole chain, in order, for free.
A PC with zero response is the best kind of fault — the break is total, so it is findable. The mistake is starting inside the cabinet. Power travels a chain: wall socket → strip or UPS → cable → the small switch on the SMPS back → the unit itself. Any broken link gives the same silent result. Test each link from the wall forward; it takes five minutes and costs nothing.
Plug a phone charger or a lamp into the exact socket the PC uses — not the one beside it. Wall sockets and their individual switches fail in Indian homes more often than any PC part, especially after the rains.
If the charger is dead too, your repair is an electrician, not a computer part. If the socket is on a separate MCB or fuse line, check the board as well.
Spike strips and small UPS units sit in the chain silently for years, and their switches, fuses and batteries die quietly. A strip with a burnt fuse passes no power at all while looking perfectly normal.
The thick black cable between the wall and the SMPS feels immortal. It is not. Internal breaks near the plugs and loose moulded connectors are common, and they fail open — completely dead, no drama.
Borrow the monitor's power cable — it is the same type in almost every setup. One swap answers the question in thirty seconds. While you are there, push both ends of the original cable fully home; a half-seated plug is a classic after a desk cleaning.
On the back panel of most SMPS units sits a small rocker switch, separate from the front power button. It gets flipped by accident during dusting, shifting the cabinet, or by a curious hand — and with it off, the front button can do nothing at all.
Look for it beside the power socket on the rear of the cabinet. It should sit on the I side, not O. This ten-second check has saved more service visits than any other step on this page.
If the socket, strip, cable and rear switch are all proven good and the PC still shows no life at all — no LED even for a second — then the suspicion finally lands where it belongs: the SMPS itself, or the path just after it.
Notice what happened: the SMPS became the suspect last, after proof — not first, on a feeling.
Watch the video to see the complete checking order performed on a real dead PC before the SMPS is condemned.
▶️ Watch Full VideoThat pattern actually clears most of the chain — power is reaching the desk. Focus on the cabinet's own cable, the SMPS rear switch, and then the unit itself. If fans spin but the screen stays black, that is a different fault; the fans-spin-no-display page in this series covers it.
A power cut followed by total silence often means the strip, UPS or socket took the hit, or the SMPS protection latched off. Unplug everything for two full minutes, then run the chain checks from the wall forward. If the SMPS smells burnt or still refuses the paperclip test afterwards, replace it.
That light runs on the +5VSB standby rail, so some power is arriving. The fault is then usually in the start path — the front button, its thin wires to the motherboard, or the main rails of the SMPS failing to come up. The paperclip and swap tests separate those two quickly.