The computer restarts right away once it shuts down.
The computer restarts right away once it shuts down.
You've just installed a new motherboard and everything seems to be working fine. However, you're experiencing some unusual behavior with your power supply and shutdown process. When you flip the power switch on the PC, it powers up immediately without pressing the case button. Additionally, when you try to shut down Windows 11, the computer turns off and then restarts right away. Could there be an issue with the power circuit or a software glitch? Thanks, Matthew.
It seems there’s a short in your power switch. Check the switch, motherboard header, or PSU sensing wire. Disconnect your PC, then remove the case power switch from the header, plug it back in, and power on the PSU. Without power, the PC should stay off. If it stays off, the issue is likely a faulty PSU or motherboard. If the reset switch still triggers "auto on," it could indicate a motherboard problem.
Ensure your case power switch isn't stuck and verify with a voltmeter. Confirm the power and reset buttons are connected correctly—power plug to reset pins, reset plug to power pins. There should be a straightforward issue affecting ground sensing, which keeps activating the PSU. A quick test without a voltmeter is to start the machine, disconnect the power button from its header, and follow the OS to power it down. If this changes its behavior, the power switch is likely the culprit.
I've checked all the options. The device keeps turning on even when the case switch or reset button isn't connected. Noticing that forcing a shutdown by pressing the power button keeps the system off and prevents auto-reboot. But using Windows to shut it down causes it to power off and then restart automatically. Odd behavior.
We can eliminate that possibility. It seems to be a motherboard or power supply issue. Did you mention it began with your new motherboard?
You’ll find a MoBo RMA soon. Did you assemble the motherboard, CPU, RAM, and power supply separately before putting everything inside the case, or did you place them together first? Could there be any metal contact on the case that might interfere with the board?
It seems like a minor glitch rather than a complete issue. Perhaps you'd find it helpful: (copied from somewhere else) Disable Windows 11's automatic restart if no problems were detected. Open Settings, navigate to System > About, select Advanced system settings from the related links. In System Properties, click the Advanced tab and choose the option below Startup and recovery. Uncheck "Automatically restart" then save your changes.