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PC keeps restarting before reaching POST

Fire Yoshi
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Alright, so to keep things simple, I have just built a new PC. It worked fine on first power-on (yay?), and the one after and so on. But a few hours after building it, when I tried to power it, it restarted like 3 times (power on, 2 seconds, power off and so on) before actually reaching the BIOS. Now, it just does that indefinitely and doesn't even reach the BIOS. Help?

Motherboard is a Gigabyte Z97MX-Gaming 5
PSU is a LEPA MaxBron 550W Modular
CPU is an Intel Core i5-4690K (not overclocked)
CPU cooler is a Corsair H60
Case is a Bitfenix Pandora Core Edition

My current build :

Hurricane Mk.I

  • CPU - Intel Core i5-4690K @ 4.6 GHz ~ 1.25V
  • Cooling - Corsair H60 2013 Edition
  • Motherboard - Gigabyte Z97MX-Gaming 5 (mATX)
  • RAM - 16 GB DDR3-1600 Avexir Core Series (Red LEDs)
  • GPU - XFX Radeon R9 Fury X @ 1100/500 MHz -24 mV
  • Case - CoolerMaster MasterCase Pro 3
  • SSD - 256 GB ADATA SX900
  • HDD - 1 TB Seagate Barracuda 7200 RPM
  • PSU - Corsair RM750 (750W 80+ Gold)
  • Display - LG 34UM67-P Ultrawide (Freesync)
  • Keyboard - CM Storm Quickfire TK (Cherry MX Red) + CM Masterkeys Pro S RGB (Cherry MX Blue)
  • Mouse - Razer DeathAdder 2013
  • Audio - Sennheiser HD598 SE with detachable mic
  • OS - Windows 10 Home Edition
  • VR - Lenovo Explorer Windows Mixed Reality Headset
  • Laptop - ASUS K501LX with i7-5500U and GTX 950M
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https://linustechtips.com/topic/288013-pc-keeps-restarting-before-reaching-post/
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