Right then;
I was attempting to upgrade an O3dsXL (V4.4.0-U) to Emunand 9.5.
I used 3DNUS to get the 9.5, booted gateway and used BigBlueMenu to install the CIAs. I then powered it off.
now when I try to power it on, the power light turns on, and it hangs on a black screen. and that's it...