Rightek Rescue · Guides · PC won't turn on
PC won't turn on, or turns on and shows nothing?
This is the one problem on this site that no software can fix, because nothing gets far enough to run. It is still worth ten minutes before you call anyone, because “won't turn on” covers three genuinely different faults and the cheap one is common.
First, work out which of these you have
Everything else depends on this. Watch and listen carefully when you press the power button:
- Completely dead. No lights, no fan noise, nothing at all. This is power — the supply, the battery, the charger or the button.
- It powers up but the screen stays black. Fans spin, lights come on, maybe you hear the drive. The machine has power and is failing before it can display anything.
- It starts and then stops. Powers on for a second or two, shuts off, sometimes repeatedly. Usually a protection circuit doing its job — often power or heat.
If you get as far as a manufacturer logo or any text on screen, you do not have this problem — the machine is booting and failing later. Try no bootable device found or the Automatic Repair loop instead.
If it is completely dead
Laptops
- Try a different charger if you can borrow one, and check the charging light. Chargers fail far more often than laptops do, and they fail silently.
- Hold the power button down for 30 seconds with the charger unplugged, then plug in and try again. This drains residual power and clears a surprising number of no-boot states.
- If the battery is removable, take it out, run on the charger alone, and see if it starts.
Desktops
- Check the switch on the back of the power supply, and try a different wall socket and a different kettle lead. Obvious, and regularly the answer.
- Look for a small light on the motherboard itself. If it is lit, the supply is delivering something and the fault is further in.
- Reseat the 24-pin and CPU power connectors at the motherboard, with the machine unplugged.
If it powers on but the screen is black
- Rule out the screen. On a desktop, try another monitor or another cable, and switch the input. On a laptop, connect an external monitor — a picture there means the panel or its backlight has failed while the computer is fine.
- Listen for beeps. A pattern of beeps at power-on is the motherboard telling you what it found. The codes are manufacturer-specific, so look up yours — it usually points straight at memory or graphics.
- Reseat the memory. Power off, unplug, remove the RAM sticks and refit them firmly. If there are two or more, try one at a time in the first slot. Memory that has crept slightly loose is a very common cause of exactly this.
- Reseat the graphics card if the desktop has one, and if the processor has onboard graphics, try the motherboard's own video output with the card removed.
If it starts and immediately stops
Usually protection circuitry rather than a dead component. Check that the CPU fan spins for the second or two it is alive; a seized fan will trigger an instant shutdown. Clear out dust. On a machine that has been running fine for years, this pattern often means the power supply is on its way out.
What about your files?
Worth saying plainly, because it is the thing people are actually worried about: a PC that will not power on has almost certainly not lost your data. The drive is a separate component from whatever failed. Even if the machine is beyond economic repair, the disk can normally be read in another machine or from a rescue USB, and your files come back.
When to stop
If you have tried a known-good charger and cable, held the power button to discharge, reseated the memory, and tried an external display, you have covered what is worth doing without test equipment. Beyond that you are swapping parts on a guess, which gets expensive quickly. That is the point to get it looked at — we do that in Edmonton, and if the machine turns out not to be worth repairing we can still get the data off the drive.
⚡ The one-click way: let Rightek Rescue do it
Rescue cannot help a machine that will not power on — nothing can, at that stage. What it can do is get your files off the drive afterwards, from a rescue USB in another PC, whether or not the original machine is ever repaired. On any working PC: download Rescue, put it on a USB (one click makes it bootable), boot the affected PC from it, and choose Fix My PC. The diagnosis is free and it tells you what it found before it changes anything.
FAQ
Are my files gone if the PC will not turn on?
Almost certainly not. Whatever failed — power supply, motherboard, screen — is a different component from the drive your files live on. The disk can normally be read in another machine or from a rescue USB even if the original PC is never repaired.
Can repair software fix a PC that will not turn on?
No, and anything claiming otherwise is selling you something. Software needs the machine to start executing code before it can do anything at all. This is a hardware fault by definition.
Why does holding the power button for 30 seconds help?
It drains residual charge from the capacitors and clears the embedded controller's state. On laptops especially, that resolves a genuine class of no-boot conditions where the machine is stuck rather than broken. It costs nothing and it is always worth trying first.
The fans spin but nothing appears. Is the PC dead?
Not necessarily. Fans spinning means power is being delivered, so the fault is further along — commonly memory that has worked loose, a graphics card that needs reseating, or the display itself. Connecting an external monitor separates the last of those from the others in about a minute.
Is it worth repairing an old PC that will not start?
Depends entirely on which part failed. A power supply or a stick of memory is cheap; a motherboard on a machine that is six years old usually is not. Diagnosis first, decision second — and either way the data comes off the drive regardless.