The board wont post with the cpu in it as the bios does not know what it is.
That is why the screen is black.
The only way around it, is to ask a friend who has cpu that will run with the current bios revision of the board, then flash it.
Then put your Cpu back in.
You could also ask your local computer shop to help you.
Just make sure you download the new bios update file stick it on a usb stick and pop into the computer shop.