I've exhausted Google search in attempt to solve my issue, and I'm fairly confident there's no single solution but I'd like to get some brand new ideas.
- ASUS X99 Sabertooth
- 8x8GB G.Skill DDR4 2800
- Intel Core i7-5820 @ 3.3 ghz
- CoolerMaster V8 GTS
- Samsung SSD 850 PRO
- EVGA SuperNOVA 750 G2 750W
- MSI GeForce GTX 970
I assembled the computer, it booted to bios on the first try after I turned it on. I first turned on XMP, the machine restarted a bunch of times and eventually gave me a "Overclock failed" message, and went back to BIOS. I thought that was weird, but I just ended up resetting BIOS to default settings. I then installed Windows 8 successfully, and began installing Windows updates. After a few hours or so, the updates finished and it prompted me to restart my computer. After doing so, the computer powered off, powered on for a half second, and powered down again. A orange/reddish light on my motherboard lit up, its located between CPU and RAM, labeled as PLED1. If I clicked the power button again, it wouldn't do anything. If I toggled the power supply switch, and attempted to start the machine, it would do the same thing, power on for about a second, the case fans spin, and it powers off, with the LED light turning on afterwards. One thing I'd like to note, is that while the computer was on, I moved it from a horizontal position (it was lying on the floor) to the upright vertical position, which did not affect its performance while it was still running.
What I have done so far:
- Unplugged EVERYTHING except for the MB, CPU, heatsink and power supply.
- Cleared CMOS (removed the battery, switched the jumper and put it back).
The issue persists, when I start the computer, it powers on for a second, and turns off, the orange/reddish MB LED turns on. If I unplug the 8-pin power connector to the CPU, and leave the power to the MB, the computer turns on, and stays on (obviously it doesn't POST or go to BIOS, but at least it doesn't power down). If I plug the CPU power back in, the issue resumes.
So to recap, I've successfully booted, and installed the operating system. After restarting the computer, it would not power on again. I'd like to ask for some ideas on how to diagnose this issue further. The strangest part is of course the fact that it all worked fine, but after a reboot it no longer works. Is it more likely that it is the MB? or the CPU?