Symptoms
- Pressing the case's power button does nothing
- PC powers on fine using a different method, like the motherboard's own power button if present
- Problem started after building, cleaning, or moving the PC
- No indicator lights respond either
Likely causes
- CommonPower switch cable disconnected or loose at the motherboard headerThis small connector can come loose easily during other work inside the case.
- CommonCable connected to the wrong pins on the front panel headerFront panel headers have several closely spaced pins for different functions.
- PossibleFaulty case power button switch itselfPhysical switches can wear out or fail, though this is less common.
- Less commonMotherboard's front panel header itself is damagedUncommon, but worth ruling out with a manual bypass test.
What to do
- Open the case and locate the front panel connector cables coming from the power button.
- Check the motherboard manual for the exact pin layout of the front panel header (often labeled F_PANEL or similar).
- Confirm the power switch cable ('PWR SW' or similar) is connected to the correct two pins.
- Test by briefly touching a metal screwdriver tip across those same two pins directly on the motherboard, which mimics pressing the button.
- If the screwdriver test powers on the PC, the button, its cable, or the connection is at fault, not the motherboard.
- Replace the case's power button switch or use the screwdriver/jumper method as a temporary workaround if needed.
Tools and parts
- Screwdriver
- Motherboard manual
When to call a pro
If the screwdriver test doesn't power on the PC either, the issue is elsewhere on the motherboard and worth having a technician check.
Safety
Use caution
Be careful only touching the intended two pins with a screwdriver, since touching the wrong pins or shorting other components could cause damage.