Z77 a2 error

Folk0

Prominent
Feb 21, 2017
2
0
510
Asrock z77 oc formula after overcklock i7 2600 and test in a OCCT for a 10 min I get temperature around 70 C so I decided put less bclk ,but after restart my pc never boot again and I can't even get into a bios, a2 error all the time, some times he just torn on and off every 2 sec.
I tried switch ram, disconnect everything( just keyboard and mouse hdmi left) switch ssd and hdd, cmos, switch bios chips with each other( on a one of them latest bios another stock) take of battery, I even think about that I burn my cpu so I put i3 2100 but nothing changes. Do you guys have any idea what is wrong, or I just killed my mobo...
 

I'm already try it, even switch bios chip, put stock one in a a slot one and overclock one with a updated bios in a slot 2, nothing changes, motherboard running fens working but no image, can't boot bios or windows, mobo only shows a2 error after trying to boot