定制组装电脑电源按钮故障求助：按动无反应且接线符合手册要求

Hey Simon, sorry to hear your custom build’s power button isn’t cooperating—let’s walk through some targeted checks since you’ve already followed the manual’s jumper diagram (page 12, 1-4) and confirmed the motherboard has power when plugged in.

Here are the most likely fixes to test in order:

• Double-check jumper placement and polarity (even if the manual says polarity doesn’t matter)
  It’s easy to misalign pins on dense motherboard headers—verify you’ve plugged the Power Switch jumper into the exact pins marked on the board (not Power LED or Reset Switch by mistake). While most power switches are non-polarized, flipping the jumper’s orientation sometimes resolves odd compatibility glitches.
• Bypass the case button entirely
  Grab a metal screwdriver or tweezers, and gently short the two Power Switch pins on the motherboard directly. If the system boots up, the problem is with your case’s power button or its connecting wire (likely a broken internal wire or faulty button contact).
• Verify all ATX power connections
  A lit motherboard doesn’t guarantee full power delivery. Make sure the 24-pin main power cable is fully seated (you should hear a click) and that you’ve plugged in the 4/8-pin CPU auxiliary power cable near the CPU socket—this is a super common oversight that prevents boot triggers.
• Rule out a short circuit
  Loose screws, metal debris, or a motherboard touching the case (missing copper standoffs) can trigger the system’s short-circuit protection. Remove the motherboard from the case, set it on an insulating surface (like the original foam packaging), connect only the essential components (CPU, RAM, 24-pin + CPU power), then try shorting the Power Switch pins again.
• Reset your CMOS
  Corrupted CMOS settings can block the power button signal. Locate the CMOS clear jumper on your motherboard (usually labeled CMOS CLR), move the jumper cap from pins 1-2 to 2-3 for 10 seconds, then move it back. Alternatively, remove the motherboard battery, wait 5 minutes, and reinsert it (unplug the power supply first!).

If none of these steps work, sharing your motherboard model and power supply details would help narrow things down further.

内容的提问来源于stack exchange，提问作者SimonS