Every repair guide should end with the page nobody writes: the one that tells you to stop. The first checks in this set catch the majority of dead PCs. The rest need spare parts to test with, instruments, and a bench — and continuing at home stops being resourceful and starts being expensive guesswork. Here is the line, drawn honestly, plus the stop signs that mean stop right now.
There is no shame in this page; there is money in it. A technician's real advantage is not magic hands — it is a shelf of known-good parts and the ability to swap a power supply in five minutes and know something certain. When your checks have narrowed the fault to the inside of that shelf — supply versus board versus processor — the economically honest tool is the bench fee, not a shopping cart. But some situations say stop before the checks run out, and those come first here.
Some evidence outranks all curiosity: smoke, a burning smell, visible scorch marks, a part that hisses or sparks, or capacitors bulging on the board. At any of these, unplug the machine and leave it unplugged. Whatever has failed has failed electrically, and re-powering it can spread the damage to parts that are still healthy — including, in a bad moment, to you. There is no first check for a burnt smell; the check is the smell, and its instructions are one line long.
If the machine contains a hard drive that clicks, grinds or beeps mechanically, and the data on it matters, stop powering the PC. Those sounds are a damaged drive damaging itself further with every attempt, shrinking what a recovery specialist could save. This rule outranks the whole checklist: no reseat is worth a family's only copy of its photos. Tell the shop clearly that data comes first — a good one will image the drive before repairing anything else.
If the PC is still under warranty — brand warranty, or a recent repair's guarantee — the honest first phone call is to the warrantor, not the screwdriver. Many no-start faults are covered repairs, and opening or swapping parts can complicate a free fix. This is not bureaucracy worship; it is arithmetic: a covered motherboard costs you a phone call, an uncovered one costs you a motherboard. Even out of warranty, a machine weeks past a repair deserves a call back to that shop before new money moves.
Compare the two real options at the point where your checks ran out. At home, the next step is buying a suspect part — say a power supply — fitting it, and learning one fact: it was, or was not, that. Wrong guesses are not returnable everywhere, and two wrong guesses quietly exceed a bench fee. A shop instead swaps its own spare in minutes, pays nothing for the test, and charges for the diagnosis and the one right part. When the suspect list is down to supply-versus-board, the bench is not surrender; it is the cheaper instrument.
Your first checks were not wasted even when they did not fix it — they are the technician's head start, if you hand them over. Write it plainly: what changed before it died (move, clean, storm, new part), what the machine does exactly (totally dead, fans only, dies in three seconds), the beep pattern or the debug LED that stays lit, and which checks you already ran — wall chain, drain, reseat, minimal boot. A shop receiving that note starts halfway down its own list, and your bill is smaller for it. That is what doing the first checks was really for.
The video covers the checks that belong at home. Do those with confidence — this page exists so you also know exactly where home ends.
▶️ Watch Full VideoA honest shop tests with its own spare parts before ordering yours, and can tell you what each swap proved. Your handover note helps you judge: a technician who asks what changed, what it does now, and what you already checked is working the same evidence ladder as these pages. One who names an expensive part in the first minute, untested, is guessing — and you are allowed to take the PC elsewhere.
Sometimes the honest answer is no, and a good technician will say so: if the verdict is a motherboard on an old machine, the repair can approach the value of a newer used PC. But reach that crossroads after the free checks — a large share of dead PCs need a supply, a stick of RAM, or just a reseat, and those repairs make sense at almost any machine age. The data on the drive, remember, is usually worth more than the box and survives either way.
No — you succeeded at the checks' real purpose. They either fix the machine (the common outcome), or they convert a mystery into a short, proven suspect list with notes. Walking into a shop saying it is dead costs you a diagnosis from zero; walking in with the wall chain proven, the drain done, the RAM tested stick by stick and the LED pattern written down is most of the diagnosis already, done free, by you.