New motherboard not working

Good afternoon! In general, the problem is as follows.
We bought a new mother, bring it home, put the computer together:
Mother - ASUS P8P67Pro Prots
- Intel Core i7-2600
Two RAM strips of 4 giga Kingston
Mother checked, everything worked like a clock.
So, the computer turned on, the system booted (Windows 10), started working, it suddenly rebooted, I did not understand why, after that it started to reboot when trying to boot the system. I suggested that the matter is in the system, perhaps after changing the motherboard, you still need to reinstall the system. I boot from disk, backup data from the system screw. There were no incidents when working with the disk. While I was backing up the data, an idea came to my mind, I connected the screws to the Marvel 6 Gigabit SATA ports, I thought that they were the problem, I reconnected the 6 Gigabit ports to Intel, I tried to boot from the screw, it did not work, when the OS was loaded again reboot. I insert the disk with Windows, start booting from it, while reading data from the disk begins, I opened the lid of the system unit in order to see what was happening there.
The boot from the disk reached almost the end and the computer just turned off, before that CPU_LED on the motherboard lit up. When you try to turn it on, CPU_LED lights up again and now DRAM_LED, it turns on for less than a split second, the cooler just barely moves and that's it, nothing else happens. The computer no longer responds to the power button until I restart the power supply.
I removed the entire body kit from the motherboard, left only RAM and percent, even turned off all the screws and the drive, nothing happened, I decided to disconnect everything and connect it again, with a minimum set, RAM + percent, I forgot to connect the power to percent, I did not notice it by accident, I turn it on computer, the mother is working, the "propellers" are spinning, the CPU_LED indicator is on, but as soon as I turn on the power, the mother stops functioning again.
At the very first start, the system worked fine, without failures, the percentages did not overheat (as I could assume at first, it works adequately), until it suddenly rebooted out of the blue (at that moment I opened uTorrent).

Now the most important thing is, tell me what it can be and how can it be fixed now?
I want to run to a friend the other day to check my percent, suddenly he still ordered to live long.