ASRock P67 PRO3 (B3) boot looping

[chlusniembousniem]

Hello
At first, sorry for my very bad english.
I have a motherboard ASRock P67 Pro3 (B3) and i5 2500K Intel
Today in the morning I left the computer under the influence of OCCT to check temperature stress. So the 10 minutes I watched it and did not want to come up to 70C. In the afternoon, when I woke up, computer turning on for 1 second and off for 3 seconds and loop this forever. Every time when I switch power off and switch to on it's the same. I took out and put different components but still the same. I took the BIOS batterie, changed jumper place but still the same. Once when I quick changed jumper, it turned on for longer, Dr. Debug (LED) turned on too and pc speaker began to beep 3 times.
Surely OCCT stress disables the errors at high temperatures. Maybe it's some Sleep mode or something? Please help

RAM - proper (tested on the old computer)
POWER - I think it's correct, even before I plugged in an old 650W was the same.
GRAPHICS - good because I mounted GPU from old comp.
CPU and motherboard - something it must be because even when I disconnected everything from the chassis it was the same
I think it processor *** I don't know in what way (I had 1.340 voltage at 4700MHz)

 

[cin19]

Set the i5 down to the normal frequency and try again to boot the PC.

What do you have the CPU cooler? No all the i5 can be OC to the 4.7GHz.

 

[Zjenep]

It looks like the clear CMOS was succesful.

If you get a repeating series of 3 beeps then there is a memory related issue.

Please test the modules 1 by 1 in different slots. When you test them on your old system, then also 1 by 1.

The memory controller is integrated in the CPU. It could be a faulty CPU. Or a contact issue with the socket pins (bent pins or cooler too tight).

Faulty motherboard is also possible.