Overclocked CPU and PC Reboots on Shutdown

[LeBob2012]

I changed my PSU for an EVGA 750W, I overclocked my CPU but Windows 7 didn't like it and it gave me a BSOD. The next time I booted, my main UEFI seemed to be corrupted so it started booting on the backup BIOS. Since that time, when I shutdown my PC or when I put it to sleep, everything goes off and it turns back on a few seconds after. My computer seems to reboot on shutdown and it's very annoying. Everytime it tries to boot on the main UEFI but it fails so it boots on the second one. I even did a CMOS reset and I flashed the BIOS. It still does the same thing and my main BIOS still looks corrupted. The only time it doesn't reboot after a shutdown is when I press and hold the power button while in Windows but it's not good to do that all the time. Could anyone help me with that? I tried a bunch of things but it never worked. I think the problem comes from one of the following things : the motherboard, Windows 7, the PSU itself or bad PSU cables.

Here are my specs :

Cooler Master (CM) Storm Scout
Gigabyte GA-970A-DS3P AM3+ NB970/SB950 Dual UEFI F1
AMD Vishera FX-6300 @4.2GHz
Patriot Viper 3 2x8GB DDR3 1600MHz 9-10-10-27 (Dual Channel 1.5V) XMP
Sapphire Dual-X AMD Radeon R9 270X OC @Core 1100MHz @Mem 1420MHz
EVGA Nvidia GTX 560 SE OC @Core 800MHz @Mem 1930MHz (wtf)
Power Supply (PSU) : EVGA Supernova NEX750B (750W) semi-modular
A total of 4TB of HDDs (SATA 6G)
Cooler Master Hyper 212 Evo
Hauppauge Colossus HD video capture card
TP-Link TL-WN951N 300MB/s wireless network card
Liteon DVD/CD Burner SATA
NZXT Hue RGB LED Controller
OS : Microsoft Windows 7 Ultimate x64

Thanks in advance for the help.

 

[LeBob2012]

I fixed it by flashing the motherboard's UEFI Dual BIOS.