Motherboard defective or processor damaged

I have a PC kit with components selected by myself. I mounted it without problem, but I have a problem with the 4 pins of the CPU auxiliary power supply (top left)

Motherboard : Asus M2N68 (socket AM2+)
Processor : Amd Athlon 64 7750 X2 dual core socket AM2+ (quite compatible)

The pc is running 2 seconds then stops when I leave the power supply plug 20 + 4 pins, + 4 auxiliary pins. pc turns on and do nothing when I let the power supply plug 20 + 4 pins only (regular) music. I disassembled then reassembled everything, and there when I plug the PC is running but does nothing. I changed my graphics card (in case) but the problem is not it. I changed my psu, always the same.

Motherboard defect? Processor Damaged?

My power supply is LC Taurus 480W (new)

Any idea? I received the new motherboard, but still the same problem! incompatibility with the processor

Several possibilities such as

The screen is black? blue? PC restarts himself? all cables are plugged in?

You have tested your other materials: RAM (if you have 2 strips, test them one after the other), and your graphics card, some times the video cards will cause such problems!

the screen is black, nothing happens.
no, the PC does not restart.
yes all cables are connected

I tested with 4 other strips of RAM, same (also with another graphics card). I conclude that this is not the motherboard that disconnected but the processor! I tried another power supply, an Antec 430 W (the one I use on my PC), no improvement.

Without RAM strips, the motherboard does beep.

In view of what you have done to change motherboard, power supply, RAM strips, graphics card, it can be inferred that your processor a stab in the helmet. Otherwise, what is your hard drive (brand model?) Because I had a diamond MAXTOR 500GB and one day he went into security and therefore nothing at startup (black screen) with the HDD LED sets.