It worked on Friday. On Saturday it was carried to another room, or given a good clean, and now it will not start. That timing is not a coincidence and it is rarely a death: journeys and cleaning do not usually break healthy parts, they persuade connections to let go. This page is the re-check list for exactly that story, in the order a technician works it.
A PC is a few dozen pressure-fit connections pretending to be one machine. Vibration from carrying, a tilt during dusting, a cable tugged while reaching behind — each can walk a connector a millimetre out, which electrically is the same as a mile. The good news: let-go connections are free to fix. The discipline: check the ones the journey could have touched, not the whole catalogue of computing, and press each one home like you mean it.
The power button talks to the board through a bunch of tiny individual plugs on a corner pin block — power switch, reset, lights. They are the loosest fit in the whole machine and the first casualty of any internal rummaging or a hard journey. If your button now does literally nothing, find this block (the board's printing names each pin), and push the PWR SW pair firmly back on. Experienced technicians can rule out a dead button by briefly bridging those two pins with a screwdriver tip; if you are not certain you have the right two pins, skip that test — the reseat alone fixes most cases.
The motherboard drinks power through two plugs: the wide 24-pin main connector and the 4 or 8 pin CPU power connector up near the processor. Both latch with a clip, and both can sit half-latched — clipped at one end, floating at the other — especially after the case was tilted and cables pulled by their own weight. The CPU power one is the famous mover's casualty: the board gets enough power to light up and spin, but the processor starves and nothing starts. Unplug the machine, press both connectors home until their latches click, and retest.
A graphics card is a heavy lever in a slot; transport vibration works it like a tooth. The symptom is fans with no picture — or a card sitting visibly crooked, one end lower than the other. Power off, unplug, press the card firmly into its slot until the slot's latch catches, and re-fasten its bracket screw. RAM creeps the same way on a smaller scale; the full reseat method lives on its own page in this set, and after a move it earns its place on this checklist too.
Not all let-go connections are internal. At the new desk, the monitor cable went into the motherboard's port instead of the graphics card's — the classic new-desk mistake, black screen with a perfectly healthy PC. The power cable may be half out of the supply. The new room's socket may simply be dead (test it with a charger). And the supply's rocker switch gets knocked to 0 by carrying more often than owners believe. Run the wall-power chain from this set before opening the cabinet in the new location.
If cleaning caused it, clean differently next time. Never vacuum inside a PC — a vacuum nozzle builds static exactly where you least want it; use short bursts from a blower or canned air, and hold fan blades still with a finger so they do not spin up and generate their own current. Work with the machine unplugged. Take a phone photo of the wiring before you unplug anything — it turns reassembly from memory work into matching work. And keep the cloth away from connector rows: wiping is how latches get lifted unnoticed.
The video's check order was built for exactly this story — a machine that was fine until someone touched it. Watch the connections confess.
▶️ Watch Full VideoAt the front panel wires inside the case. Their tiny plugs are the loosest in the machine, and a journey or a clean is exactly what pops the power-switch pair off its pins. Reseat that pair by the pin diagram printed beside the block. While you are there, press home the 24-pin and CPU power connectors — the other two movers' casualties.
Cleaning rarely kills parts; it disturbs connections and, with a vacuum cleaner, can threaten parts with static. Blown dust into a connector seat, a latch lifted by a cloth, a fan spun hard by air — the fixes are the reseat list on this page. For the next clean: unplug, use gentle air bursts, hold the fans still, and photograph the wiring before unplugging anything.
Possibly, but do not conclude it yet. A move also means a new desk: prove the new socket with a charger, confirm the supply's rocker switch survived the carrying, and re-run the monitor input and cable checks. Only when power, connections and picture path are each proven does the suspicion honestly move to the board — and by then you have a clean evidence list for the bench.