About a week ago I received the components from my computer and my brother, who has a lot of experience building computers over the years and has built all his own, helped me put it together.
The first day or two the computer was running fine. After that, it started having random shut downs. The first few times it did it, the computer would completely shut down and then try to boot back up. The fans would start but the monitor wouldn't even get a chance to fully turn on before it shut down again. I turned off the power supply and waited an hour, it worked for the rest of the night.
The next day, the same thing happened. This time I tried to let the computer boot on it's own and it could not. After a few loops, each lasting less time then the ones prior, the attempted boot ups lasted a fraction of a second before turning itself off and attempting a restart, I am unsure if the hard drive even had a chance to start rotating. I once again turned off the power supply and left it to sit. About an hour later when I came back, it still wouldn't boot. I had to leave it overnight.
Next day it lasted almost the entire day. After reading some forums and the screen turning various shades of the rainbow a few times, I figured it may be the RAM. Had to purchase new RAM and installed it today. Computer ran fine for about 4 hours straight. Then it shut down and booted up without prompting for Windows repair or starting Windows normally.
Now we've been fighting with it all night. The computer has gone through multiple stages of shutting itself down, sometimes turning back on, and sometimes attempting to turn on but shutting right back down. So far, we have tried replacing the RAM, shutting down the power supply, tried setting BIOS to all default settings. Core temp reads that everything is coming out either below normal or normal even when the computer is pushed to 100%(Prime95). The average temp is about 35-40C. Below is a list of what is in this computer.
GIGABYTE GA-Z68XP-UD3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
COOLER MASTER Storm Sniper SGC-6000-KXN1-GP Black Steel, ABS Plastic, Mesh bezel ATX Mid Tower Computer Case
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model
GIGABYTE GV-N570OC-13I Rev2.0 GeForce GTX 570 (Fermi) 1280MB 320-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
It also sounds like a psu issue to me. Sometimes a bad psu will overheat and shutting them down for a while allows them to cool off. Did u check to make sure the psu has good ventilation and the fan is spinning on it?
The fans are all doing well, and I have amazing ventilation on this system. Everything remains nice and cool. RAM has been replaced already and did not fix the problem. Replacement PSU will be here in a few days so I can try that. Thanks for the help, I'll let you know how it goes.