Why does the motherboard not turn on with a powerful processor?

Question

Iron

PC Config: AMD Athlon II X2 240e (standard cooling), Kingston 8Gb DDR3 1600 memory, Asus M5A97 Evo R2.0 mother - BIOS 2603, Nvidia GTX 650 video, 500W Chieftec CTB-500S PSU 85+ efficiency, SSD, HDD, drive, 3 coolers.
I bought a used AMD FX-8120 processor, I install it with Zalman CNPS10X Optima cooling, I turn on the computer and the screen is dark, the BIOS does not start and the CPU LED is on. I thought maybe there was not enough power, I checked it on the website outervision.com/power-supply-calculator, it should be enough based on calculations. What could it be?
Update: Bought an AMD Phenom II X6 1045t today, same story. Does not turn on. I tried it on another ASUS M4A88T-V EVO / USB3 motherboard, the same thing (
Update 2: I wrote to the asus website, I'm waiting for an answer and generally wrote everywhere)

Answer 1

Did you look at the manufacturer's website which processors the motherboard supports before buying? Sometimes 6-8 cores are supported only after updating the BIOS, see which version is the latest on the manufacturer's website.

Answer 2

BIOS version?