The front panel header brings bad luck.
The front panel header brings bad luck.
My machine suddenly powers off after startup, sometimes for a few seconds or up to half an hour. It seems to function normally until it shuts down abruptly. There are no other issues reported; everything appears operational until the moment it turns off. This occurs across Windows, UEFI, during bootup and at various stages in between. After several attempts to replace parts and test, I suspect the front panel header is the culprit. Although I'm uncertain about the cause, intermittent shorts seem likely, leading to unexpected shutdowns. Usually, I can restart it, but sometimes it fails completely. It never powers on by itself—only turns off. This suggests the problem isn't with the power button itself. I've disabled the power button in Windows so it shouldn't trigger shutdown, yet longer presses still cause it to cut off. My theory is that the motherboard interprets a held-down power button as a fault. Even if the power pins aren't shorted, the board might misinterpret the signal. From what I understand, only the power button connector (pwrbtn+) receives 5V when the machine is off, possibly due to chassis interference. When the ground (gnd) connection also reaches 5V, the system boots. The pwrbtn-/gnd connection is right above the reset signal line. If the reset pin isn't resetting properly, the shutdown could be triggered. I'm unsure about the exact mechanism but believe desoldering that pin might resolve the issue. It's not necessary and I think disabling it in BIOS could help. This seems quite unusual, but I'm at a loss with solutions.
Consider inserting the reset switch into the power port on the motherboard, keep the front panel switch disconnected. Observe any changes in behavior.
You changed several parts. In your experience, the front panel didn’t fail. You didn’t remove any components from the motherboard, only checked the reset switch.
Separate the concern completely, remove every front panel connector, connect the power pins together for startup and operation, then check if it shuts down again. If it does, the problem isn’t related to your front panel.
All connectors remain unplugged yet the problem persists. The case lacks a reset button. I replaced the PSU, removed the GPU, unplugged all devices except the KVM, but the issue remains. I swapped RAM sticks one at a time across all slots and still faced the problem. Used different power cables, switched outlets, tried surge protection—no help. Cleared CMOS, installed a new BIOS battery, and everything seemed fine. It could still be the CPU, but the machine only powers off gradually without crashing. The motherboard is out of warranty, so I’m open to repairing it if possible.
This way I’ve been getting it working. At first I believed my power button was faulty, causing shorts that made the PC stay on even after the connector was taken off, but it still shut down eventually. Possibly something entered the pins or got inside. Since it’s humid here, corrosion might be the issue.
Yes, you're correct. There are no connectors linked to the JFP pins at all.