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The computer is off. I press the power switch. After 1,5 seconds, the lights turn on, fans begin to spin. A second later, it shuts down. Another second later, it turns itself back on and boots successfully. What is happening with it?

  • Motherboard: Gigabyte H360M GAMING HD
  • PSU: Gigabyte PW400 80 Plus 400w
  • i3-8100 w/ UHD Graphics 630
  • 8 GB of DDR4-2400 Mhz RAM
  • Case pins for power leds and switches are correctly installed according to markings on the motherboard indicated where each should go.

All components brand new. Recently assembled. Problem always reproducible.

  • 1
    I would try another psu. – Moab Feb 15 at 16:15
  • What have you tried to do to fix it so far? Have you swapped any of the hardware components out with others to try to narrow down a source of the issue? – music2myear Feb 15 at 16:16
  • At first I thought the CMOS was being reset, but it is holding all my settings. The little battery is new. Would the PSU cause this? After it boots, I can use it for hours and hours, even gaming. It never shuts down or anything. – Doug Feb 15 at 16:20
  • This behavior is normal on some Intel boards. – Daniel B Feb 18 at 13:36
  • I've seen mixed conclusions about this behavior online. Some said it is normal, while others blamed PSU, CPU, Mobo, bad/missing grounding, etc. I tried a different PSU, same behavior. Changed the CMOS battery, same behavior. Checked for anything shorting the motherboard inside the case and reseated everything, no change. So I will simply acknowledge that this is a normal behavior, but it should be documented somewhere so we don't have to spend hours searching from unoficial sources. – Doug Feb 18 at 19:28
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I got in touch with Gigabyte eSupport, and they explained to me that, when the board stays unpowered for a while, turning it on will cause it to perform a false start in order to properly power up everything. So it is normal.

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