Check the power cord, socket and power board, and 30% of the problems are solved; 2. Test the power unit (PSU), short the 24-pin interface green and black wire with a paper clip to see if the fan rotates; 3. Observe the motherboard LED, keyboard light or error code to find weak signs; 4. Remove all non-essential hardware and try to minimize startup, and gradually troubleshoot the faulty components-In this order, you can quickly locate the root cause of no power problem and avoid misjudging the motherboard failure.
If your PC won't turn on—no fans spinning, no lights, no beep—it's usually a hardware issue. Don't panic. Start with these steps to isolate the problem quickly and efficiently.

? 1. Check the Power Source (Most Common Fix)
Before diving into the internals, rule out the basics:
- Power cable : Swap it with a known-good one (like from a monitor). A frayed or faulty cable is a frequent culprit.
- Wall outlet : Plug in another device (lamp, phone charger) to confirm the outlet works.
- Power strip/UPS : Bypass it—plug directly into the wall. Some strips have tripped breakers or failed surge protection.
- Laptop users : Try removing the battery and running on AC power only.
This fixes about 30% of "no power" cases—don't skip it.

? 2. Inspect the PSU (Power Supply Unit)
If the power source checks out, the PSU might be dead or underperformance:
- Listen/feel : No fan spin or faith hum? Likely dead PSU.
- Check the 24-pin motherboard connector : Use a paperclip test:
- Unplug the PSU from the wall.
- Locate the 24-pin cable going to the motherboard.
- Find the green wire (pin 16) and any black wire (ground).
- Short them with a paperclip—then plug the PSU back in.
- If the PSU fan spins, it's likely OK. If not, replace it.
?? Note: Some modern PSUs won't spin without a load from the motherboard—this test isn't 100% foolproof, but it's a fast first check.

? 3. Look for Minimal Signs of Life
Even if the PC doesn't boot, subtle clues help:
- LEDs on motherboard : Do any stay lit (like standby power)?
- Keyboard lights : Press Caps Lock—do they blink when you press the power button?
- Beep codes or LED error codes : Some motherboards have built-in diagnostics (eg, ASUS Q-LED, MSI EZ Debug LEDs).
No signs at all? Likely:
- Dead PSU
- Shorted motherboard
- Faulty power button (try shorting the front-panel pins with a screwdriver)
? 4. Minimal Boot Test (Advanced but Effective)
Remove everything non-essential:
- Unplug all drives, USB devices, GPU (use integrated graphics if available).
- Leave only CPU, one RAM stick, and PSU connected.
- Try powering on.
If it works now, add components back one by one to find the faulty part.
If not, the issue is likely the motherboard, CPU, or RAM—test with known-good parts if possible.
Bottom line : Start simple—most "no power" issues are power cables, outlets, or PSUs. If those check out, isolate components methodically. Don't assume it's the motherboard right away—it's often the easiest (and most expensive) to blow.
Basically, just work from wall socket to PSU to motherboard. Takes 15 minutes, saves a trip to the repair shop.
The above is the detailed content of Troubleshooting a PC That Won't Turn On. For more information, please follow other related articles on the PHP Chinese website!

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