C30nn4

Hi (literally created an account to ask about this) I followed all the instructions and managed to get as far as completing the EFI stage but once I completed that and rebooted to switch back to BIOS to complete the process it has just been hanging on the blinking underscore screen and not doing much if anything, on either of the D2607s I ran through (they're 21s and I used the 21 version, and second time through I wiped it twice before running the rest. No difference). What's gone wrong here? I can't imagine it's hardware related when both those devices aren't booting Thanks