My DH77EB boards came with 0053 BIOS. I suspect this BIOS is too old to have proper support for 3rd generation Core CPUs. I wish I had realized this earlier, as I wasted a whole bunch of hours trying to rescue the two boards after they were flashed to death, with an i7-3770K CPU installed. I reached a breakthrough only after switching back to an i7-2700K CPU.
Perhaps you should re-install your original CPU, boot up the board, flash the BIOS to something newer than 0053 (but not necessarily the latest 0097), then move back to the i7-3770K CPU only after everything checks out with the updated BIOS.
These DH77EB boards appear capable of exhibiting very different behavior with different generations of Core CPUs installed, which took me completely by surprise.