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I built a new computer two months ago:

  • Motherboard: ASUS H87-Pro
  • Processor: i5-4570
  • Memory: Vengeance LP - 2x 4 Go - PC12800 - 1600 MHz - CL9 - CML8GX3M2A1600C9 in slots A2 and B2.
  • Case: Advance Monster
  • Hard drive: WD Blue Caviar 500G
  • PSU: Corsair CX500M

I began to experience a strange problem ~3 weeks after the assembly. When I first turn on the computer just after connecting the power outlet, the computer runs fine. When I turn on the computer a few minutes after turning it off, the computer runs fine. But if I turn on the computer more than ~20minutes after turning it off, it begins a sequence of quick "reboot loop", more or less longer before starting the OS: the computer begins to start (the fans start, the MemOK LED flashes once as usually) and then the computer stops (not always after the same duration) and starts again... Until a successful start (that I first noticed with the usual beep).

When the computer gets to start the operating system, it is stable: I can use 100% of the resources for several hours without any concern.

The problem persists with:

  • only one memory slot in A1 which passes the memtest.
  • another PSU.
  • without any PCI extension card.
  • without hard drive or optical drive.
  • older or newest BIOS.
  • Clear RTC using pins on the motherboard.

I begin to think it's a manufacturing bug in this motherboard but I find it strange that the system is stable when it arrives to start and that I can power on the computer without any issue when it was just shut down (maybe a capacitor problem?).

Do you have any idea? Something I forgot? If it is the motherboard, how to explain these symptoms?

Thanks.

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Clean all the RAM and PCIe connectors with contact spray. Also reseat the memory, just take it out and reinstall in another slot. Check the 12V CPU connector –  Nikola Dimitrijevic Oct 6 '13 at 0:29
    
Do no spray or clean anything! Unless you want to damage your PC or void your warranty. In this situation its best to make sure you have the latest BIOS/firmware/drivers. Check the manufacturers websites to see if their are any updates. –  Keltari Dec 2 '13 at 4:29

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