Z77A-G45 + i5-3570K = no monitor output

Hi guys,
at first I´m sorry for my bad english and sorry if this topic doesn´t belong here.
Three days ago I have just built my first pc. When I plug my CPU i5-3570K (which should be fully supported) into my main board (Z77A-G45) and switch the power on, I have no monitor output from either the MB or GPU output, while computer is still running. Everything else is plugged correctly. Then I borrowed and tried to put another CPU (i5-2500) into my main board and monitor display worked fine. It means to me that mother board is not damaged. Then I have tried to put my CPU (i5-3570K) into different main board (PA65-UD3-B3) and it worked correctly also. (I was able to get into bios, could install OS, etc...). That means to me that my cpu (i5-3570K) is not damaged as well. I have also tried several times flash bios for CPU 3570K version but without any changes. ( If I remember correctly default bios version was 7752v25. So I have tried to flash at first into 7752v23 and than to newer 7752v28 and 7752v29). My main board (Z77A-G45) is working, my CPU (i5-3570K) is working also but only separately. My question is: why this main board (Z77A-G45) doesn´t work with this CPU (i5-3570K) together and what can i do next? I am pretty desperate because i can´t return my main board or cpu to seller when every part work separately. And MSI bench in Czech republic only repair laptops and all-in-one pc (thats what they said to me through phone call)
I am kindly asking you for any recommendation and advice in this regretful situation.
Thank you all.
Board: MSI Z77A-G45
Bios: 2.8 or 2.9 (not sure because i can´t get into bios now)
VGA:   Sapphire HD 7870 XT BOOST 2GB DDR5
PSU:   Seasonic S12II-620W
CPU:   Intel Core i5-3570K BOX
MEM:  CRUCIAL 8GB (kit 2x 4GB) Ballistix Sport 1600MHz CL9
HDD:  WD Blue WD10EZEX 3.5" 1TB
COOLER: default intel cooler in box with CPU
OS: don´t have any

I have attached bios version .2A0 for you to try. This is the next full release although it hasn't made it to the website yet.
>>Use the MSI HQ Forum USB flasher<<
Use option 1 of the tool and point it at the compressed archive. Do no decompress. Then point it at your fat 32 formatted flash drive. When the tool is done, boot to the usb drive and follow the directions.
You will need to re-install the ME drivers when complete.
You can see the release notes here:
https://forum-en.msi.com/index.php?topic=161033.0

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