You have run into an incompatibility issue. There are two types of incompatibility issues that could be affecting you, (1) video card's hardware (PCIe) requirements are not being met by the motherboard, or (2) BIOS' Op ROM (device driver) requirements are not being met by this video card. The E6 POST code would point towards it being the latter issue (E6 means BIOS started connecting drivers - and likely hung). Though it rarely works, one thing you could try is enabling UEFI. If this gets you past the issue and to the point of booting, you may find that you cannot actually boot - and you have to reinstall your O/S - but this may be (at least in the short term) better than purchasing new motherboard, processor and memory. Another alternative is to return this card and purchase one that is not quite so new...
Not the greatest of news, I know, but also not that surprising; your board is 5+ years (and 5+ hardware and BIOS generations!) out of date.
I will try to enable UEFI, hope it work.
Thanks for your help.
I am not saying that you have to go back to the 2011 video cards. At the same time, I cannot offer much guidance on what will work (I don't track them closely). I myself have successfully used Radeon HD 5600 and 5700 Series, various Radeon X1000 Series and various NVidia GTX 250/260/280 series adapters, but this certainly isn't an exhaustive list of possibilities...
To me, it's not problem to use one of old(not so old) video cards, because i'm not hardcore gamer, that must play on 60fps.
I just want to be sure for buying new card.